feat: support querying field column names in Prometheus HTTP API (#3880) #413

Job	Run time
Check typos and docs	11s
Build GreptimeDB binaries (ubuntu-20.04)	4m 9s
Clippy	3m 5s
Rustfmt	1m 20s
Check (windows-latest)	7m 28s
Check License Header	1m 20s
Toml Check	3m 13s
Check (ubuntu-20.04)	1m 48s
coverage	1s
Unstable Fuzz Test (unstable_fuzz_create_table_standalone)	13m 26s
Sqlness Test with Kafka Wal (ubuntu-20.04)	3m 7s
Fuzz Test (fuzz_create_table)	4m 41s
Sqlness Test (ubuntu-20.04)	3m 59s
Fuzz Test (fuzz_alter_table)	4m 42s
Fuzz Test (fuzz_create_database)	4m 46s
Fuzz Test (fuzz_create_logical_table)	4m 38s
Fuzz Test (fuzz_alter_logical_table)	5m 18s
Fuzz Test (fuzz_insert)	4m 41s
Fuzz Test (fuzz_insert_logical_table)	4m 58s
	1h 16m 51s

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