fix: correct is_exceeded_size_limit behavior for in-memory store

[WenyXu]

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 fixes the behavior of PaginationStream, ensuring it automatically adjusts the next request's page_size when the range response size from the in-memory store exceeds the size limit.

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 79.51807% with 17 lines in your changes missing coverage. Please review.

Project coverage is 83.80%. Comparing base (0f116c8) to head (336aaf9).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5082      +/-   ##
==========================================
- Coverage   84.02%   83.80%   -0.23%     
==========================================
  Files        1157     1157              
  Lines      216415   216477      +62     
==========================================
- Hits       181849   181411     -438     
- Misses      34566    35066     +500