feat: do not keep MemtableRefs in ScanInput

[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 a new struct MemtableRanges and lets the Memtable::ranges() method return it. Then the ScanInput can keep the MemtableRanges instead of MemtableRef.

This change ensures the scanner won't reference the memtables. The allocated bytes for the memtables can drop after flush. This avoids a long-running query stalling the ingestion.

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 92.68293% with 3 lines in your changes missing coverage. Please review.

Project coverage is 83.79%. Comparing base (18e8c45) to head (b83e8de).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5184      +/-   ##
==========================================
- Coverage   84.04%   83.79%   -0.25%     
==========================================
  Files        1175     1175              
  Lines      218979   218980       +1     
==========================================
- Hits       184039   183504     -535     
- Misses      34940    35476     +536     

[v0y4g3r]

LGTM

[discord9]

LGTM