[FEAT] configure postgres & pgbackrest compression algorithm (lz4, zstd)

[Vonng]

Try using zstd in wal compression and pgbackrest archive

[Vonng]

We may need to introduce a new paramter (pg_compress_type) a enum param with lz4, zstd as available options.

• For better compress speed, use lz4 (default level 1)
• For better compress ratio, use zstd (default level 3 for pgbackrest, default level 1 for postgres)

This value should be render to

• pgbackrest: compress-type
• patroni.yml: wal_compression