feat: track channels with query context and w/rcu

[sunng87]

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?

This patch adds a new field channel in query context so the execution path now knows which source the query comes from. It also add this channel to meter, by which we can add statistics for w/rcus of each channel.

Upstream changes that has to be merged before this:

• feat: add channel field to query context greptime-proto#183
• feat: add traffic source to meter record greptime-meter#24

Note that this patch changes QueryContext extension type in axum, from QueryContextRef to plain QueryContext so that we can modify it in http handlers, to set channel field based on different handler.

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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[shuiyisong]

Please resolve conflicts first _(:з」∠)_

[shuiyisong]

Rest LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 62.13592% with 39 lines in your changes missing coverage. Please review.

Project coverage is 84.60%. Comparing base (7daf24c) to head (47fb16d).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4448      +/-   ##
==========================================
- Coverage   84.87%   84.60%   -0.27%     
==========================================
  Files        1081     1081              
  Lines      193011   193147     +136     
==========================================
- Hits       163809   163405     -404     
- Misses      29202    29742     +540