refactor: put together HTTP headers (#3337) #13513

Job	Run time
Check (windows-latest)	4m 15s
Spell Check with Typos	17s
Check (ubuntu-20.04)	1m 36s
Build GreptimeDB binaries (ubuntu-20.04)	4m 19s
Toml Check	16s
Clippy	1m 59s
Rustfmt	21s
coverage	10m 29s
Compatibility Test	42s
Sqlness Test (ubuntu-20.04)	1m 54s
Sqlness Test with Kafka Wal (ubuntu-20.04)	2m 33s
	28m 41s

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