feat: enable zstd compression and encodings in merge tree data part (… #115

Job	Run time
Check (windows-latest)	5m 56s
Check (ubuntu-20.04)	1m 34s
Spell Check with Typos	20s
Build GreptimeDB binaries (ubuntu-20.04)	4m 5s
Clippy	2m 2s
Rustfmt	24s
Toml Check	27s
coverage	1s
Sqlness Test (ubuntu-20.04)	1m 58s
Compatibility Test	29s
Sqlness Test with Kafka Wal (ubuntu-20.04)	3m 8s
	20m 24s

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