feat: yields empty batch after reading a range

[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 adds an empty batch to the end of the stream for each PartitionRange.

It also adds a BatchChecker to validate batches in the scanner.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

[codecov]

Codecov Report

Attention: Patch coverage is 60.18519% with 43 lines in your changes missing coverage. Please review.

Project coverage is 84.00%. Comparing base (e0c4157) to head (9614b53).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4845      +/-   ##
==========================================
- Coverage   84.26%   84.00%   -0.27%     
==========================================
  Files        1128     1128              
  Lines      208260   208363     +103     
==========================================
- Hits       175494   175030     -464     
- Misses      32766    33333     +567