feat: track prometheus HTTP API's query latency

[waynexia]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

• Add metrics to Prometheus-compatible query endpoints. Those need no computation are ignored.
• Update grafana dashboard correspondingly

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.61%. Comparing base (f0c953f) to head (dddae10).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4458      +/-   ##
==========================================
- Coverage   84.88%   84.61%   -0.27%     
==========================================
  Files        1081     1081              
  Lines      192961   192961              
==========================================
- Hits       163793   163273     -520     
- Misses      29168    29688     +520