feat(flow): flow worker (#3934) #16165

Job	Run time
Check typos and docs	7s
Build GreptimeDB binaries (ubuntu-20.04)	5m 21s
Check (windows-2022)	8m 57s
Clippy	3m 35s
Check (ubuntu-20.04)	2m 40s
coverage	17m 54s
Rustfmt	51s
Toml Check	55s
Check License Header	1m 20s
Fuzz Test (fuzz_create_table)	5m 38s
Sqlness Test (ubuntu-20.04)	2m 25s
Fuzz Test (fuzz_alter_table)	5m 37s
Sqlness Test with Kafka Wal (ubuntu-20.04)	3m 8s
Unstable Fuzz Test (unstable_fuzz_create_table_standalone)	15m 20s
Fuzz Test (fuzz_create_database)	6m 17s
Fuzz Test (fuzz_create_logical_table)	6m 4s
Fuzz Test (fuzz_alter_logical_table)	6m 8s
Fuzz Test (fuzz_insert)	5m 52s
Fuzz Test (fuzz_insert_logical_table)	5m 57s
	1h 44m 6s

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