refactor(mito): tidy memtable stats

[v0y4g3r]

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?

Extract the logic to track memtable write metrics and update memtable timestamp ranges into a common mod for reuse.

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 88.67925% with 6 lines in your changes missing coverage. Please review.

Project coverage is 83.82%. Comparing base (0b6d78a) to head (d2efc48).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4982      +/-   ##
==========================================
- Coverage   84.06%   83.82%   -0.25%     
==========================================
  Files        1144     1144              
  Lines      213143   213113      -30     
==========================================
- Hits       179176   178633     -543     
- Misses      33967    34480     +513