feat: support to create & drop flow via grpc (#3915) #16029

Job	Run time
Check typos and docs	6s
Check License Header	1m 20s
Check (windows-latest)	7m 29s
Toml Check	27s
Check (ubuntu-20.04)	1m 37s
Build GreptimeDB binaries (ubuntu-20.04)	3m 53s
Clippy	2m 53s
coverage	12m 24s
Rustfmt	22s
Sqlness Test with Kafka Wal (ubuntu-20.04)	2m 59s
Unstable Fuzz Test (unstable_fuzz_create_table_standalone)	11m 36s
Fuzz Test (fuzz_create_table)	4m 32s
Fuzz Test (fuzz_alter_table)	4m 42s
Sqlness Test (ubuntu-20.04)	2m 13s
Fuzz Test (fuzz_create_database)	4m 54s
Fuzz Test (fuzz_create_logical_table)	4m 51s
Fuzz Test (fuzz_alter_logical_table)	4m 39s
Fuzz Test (fuzz_insert)	4m 29s
Fuzz Test (fuzz_insert_logical_table)	4m 49s
	1h 20m 15s

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