Cliff Frey f72b32b470 azureblob: add metadata and tags support across upload and copy paths ...

This change adds first-class metadata support to the Azure Blob backend,
including headers, user metadata, tags, and modtime overrides, and wires
it through uploads and server-side copies.

There is a behavior change in that rclone will now set the "mtime"
custom metadata when doing server side copies to azure and the
`--metadata` argument is given.

- Map standard headers: cache-control, content-disposition, content-encoding,
  content-language, content-type to corresponding x-ms-blob-* HTTP headers.
- Map user metadata: any non-reserved keys (excluding x-ms-*) are sent as
  blob user metadata. Keys are normalized to lowercase for consistency.
- Support tags: parse `x-ms-tags` as a comma-separated list of key=value
  pairs and apply them on uploads and copies.
- Support mtime override: accept `mtime` in metadata (RFC3339/RFC3339Nano)
  to override the stored modtime persisted in user metadata.

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commands

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oracleobjectstorage

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_index.md

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alias.md

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amazonclouddrive.md

amazonclouddrive: remove Amazon Drive backend code and docs #7539

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archive.md

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authors.md

Add Duncan Smart to contributors

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azureblob.md

azureblob: add metadata and tags support across upload and copy paths

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azurefiles.md

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b2.md

b2: support authentication with new bucket restricted application keys

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bisync.md

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box.md

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bugs.md

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cache.md

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changelog.md

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chunker.md

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cloudinary.md

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combine.md

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compress.md

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contact.md

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crypt.md

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docker.md

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docs.md

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doi.md

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downloads.md

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drive.md

docs: Clarify OAuth scopes for readonly Google Drive access

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dropbox.md

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faq.md

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fichier.md

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filefabric.md

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filelu.md

docs: note where a provider has an S3 compatible alternative

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filescom.md

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filtering.md

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flags.md

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ftp.md

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gofile.md

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googlecloudstorage.md

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googlephotos.md

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gui.md

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hasher.md

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hdfs.md

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hidrive.md

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http.md

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iclouddrive.md

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imagekit.md

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install.md

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install.sh

install.sh: fix harmless error message on install

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internetarchive.md

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jottacloud.md

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KEYS

docs: document release signing and verification

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koofr.md

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licence.md

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linkbox.md

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local.md

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mailru.md

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mega.md

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memory.md

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netstorage.md

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onedrive.md

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opendrive.md

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overview.md

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pcloud.md

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pikpak.md

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pixeldrain.md

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premiumizeme.md

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privacy.md

docs: update privacy policy with a section on user data

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protondrive.md

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putio.md

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qingstor.md

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quatrix.md

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rc.md

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release_signing.md

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remote_setup.md

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s3.md

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seafile.md

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sftp.md

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sharefile.md

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smb.md

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sponsor.md

Add Shade as sponsor

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storj.md

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sugarsync.md

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swift.md

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union.md

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uptobox.md

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webdav.md

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yandex.md

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zoho.md

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