feat: [shard-distributor]Compress data before writing to ETCD

[gazi-yestemirova]

What changed?

• Update Shard-distributor Store config to accept Compression field, to set the compression type. Defaults to none
• Add Compress() method to encode data with snappy compression
• Compress executor state, reported shards and assigned state before writing to etcd
• Extend unit-tests with compression logic check

Why?
To reducing storage footprint

How did you test it?
unit-tests and local testing

Potential risks
N/A

Release notes

Documentation Changes