This will serve as a base for converting this to a one-step conversion
to Protobuf. The main goal is not to be faster, but we don't want to be
slower and faster would be a nice bonus.
```
goos: linux
goarch: amd64
pkg: akvorado/inlet/flow
cpu: AMD Ryzen 5 5600X 6-Core Processor
BenchmarkDecodeEncodeNetflow
BenchmarkDecodeEncodeNetflow-12 39586 29199 ns/op
BenchmarkDecodeEncodeSflow
BenchmarkDecodeEncodeSflow-12 24349 48914 ns/op
ok akvorado/inlet/flow 3.167s
DONE 0 tests in 3.636s
```
Raw data files can be converted with Scapy:
```python
from scapy.all import *
wrpcap("data-1140.pcap",
Ether(src="00:53:00:11:22:33",dst="00:53:00:44:55:66")/
IP(src="192.0.2.100", dst="192.0.2.101")/
UDP(sport=47873,dport=6343)/
open("data-1140.data", "rb").read())
```
