feat: collect reader metrics from prune reader

[evenyag]

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 PR collects metrics from prune readers to PartitionMetrics so we can get prune metrics in the final debug log.

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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[v0y4g3r]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 95.45455% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.77%. Comparing base (a30d918) to head (2e2877f).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5152      +/-   ##
==========================================
- Coverage   84.04%   83.77%   -0.27%     
==========================================
  Files        1168     1172       +4     
  Lines      217646   218196     +550     
==========================================
- Hits       182923   182800     -123     
- Misses      34723    35396     +673