fs: Add --max-delete-size a delete size threshold

Fixes #3329

fs/config.go

@@ -71,6 +71,7 @@ type ConfigInfo struct {
 	InsecureSkipVerify      bool // Skip server certificate verification
 	DeleteMode              DeleteMode
 	MaxDelete               int64
+	MaxDeleteSize           SizeSuffix
 	TrackRenames            bool   // Track file renames.
 	TrackRenamesStrategy    string // Comma separated list of strategies used to track renames
 	LowLevelRetries         int
@@ -162,6 +163,7 @@ func NewConfig() *ConfigInfo {
 	c.ExpectContinueTimeout = 1 * time.Second
 	c.DeleteMode = DeleteModeDefault
 	c.MaxDelete = -1
+	c.MaxDeleteSize = SizeSuffix(-1)
 	c.LowLevelRetries = 10
 	c.MaxDepth = -1
 	c.DataRateUnit = "bytes"