feat: Implement write and fork for the new memtable #13539

Job	Run time
Build GreptimeDB binaries (ubuntu-20.04)	4m 36s
Spell Check with Typos	20s
Toml Check	26s
Check (windows-latest)	6m 1s
Clippy	2m 1s
Check (ubuntu-20.04)	1m 28s
coverage	10m 12s
Rustfmt	30s
Sqlness Test (ubuntu-20.04)	1m 38s
Sqlness Test with Kafka Wal (ubuntu-20.04)	2m 15s
Compatibility Test	27s
	29m 54s

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