chore: use pointer receivers for PebbleDB methods

[songgaoye]

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PR checklist

• Tests written/updated
• Changelog entry added in .changelog (we use unclog to manage our changelog)

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Note

Converts select PebbleDB and iterator methods to use pointer receivers to avoid value copies and ensure stateful behavior.

• Change DeleteSync, Close, and iterator Next to pointer receivers in pebble.go
• No logic changes to method bodies; interfaces continue to be implemented via *PebbleDB
• Update tools/Dockerfile to add CXXFLAGS="-Wno-maybe-uninitialized" when building RocksDB to suppress compiler warnings

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 78.41%. Comparing base (fb4f703) to head (abf2e28).
⚠️ Report is 76 commits behind head on main.

Files with missing lines	Patch %	Lines
pebble.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #282      +/-   ##
==========================================
+ Coverage   76.80%   78.41%   +1.60%     
==========================================
  Files          23       23              
  Lines        2048     1700     -348     
==========================================
- Hits         1573     1333     -240     
+ Misses        403      294     -109     
- Partials       72       73       +1     

Files with missing lines	Coverage Δ
pebble.go	73.61% <66.66%> (+0.04%)	⬆️

... and 21 files with indirect coverage changes

Files with missing lines	Coverage Δ
pebble.go	73.61% <66.66%> (+0.04%)	⬆️

... and 21 files with indirect coverage changes

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