feat: add extension field to HeartbeatRequest

[fengjiachun]

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What's changed and what's your intention?

As the title said

proto: GreptimeTeam/greptime-proto#190

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

Attention: Patch coverage is 95.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 84.54%. Comparing base (506dc20) to head (b55ab57).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4688      +/-   ##
==========================================
- Coverage   84.78%   84.54%   -0.24%     
==========================================
  Files        1109     1109              
  Lines      199561   199632      +71     
==========================================
- Hits       169206   168788     -418     
- Misses      30355    30844     +489