feat(puffin): finish return written bytes

[zhongzc]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

Puffin writer to return written bytes, to help the upper layer to track it.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR does not require documentation updates.

Refer to a related PR or issue link (optional)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b9302e4) 85.58% compared to head (18714c5) 85.08%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3082      +/-   ##
==========================================
- Coverage   85.58%   85.08%   -0.50%     
==========================================
  Files         805      805              
  Lines      130658   130666       +8     
==========================================
- Hits       111822   111182     -640     
- Misses      18836    19484     +648     

[killme2008]

LGTM. We'd better add some metrics for the indexing module.