feat: add benchmark for column store and optimize performance

[sotkvh]

What's changed and how does it work?

This PR adds a table-level benchmark and improves the column-store hot path.

• Add table_interface_benchmark to compare row-store vs column-store point lookup and full scan.
• Refactor row encoding/decoding into shared layout-based helpers (RowEncodingLayout) and reuse them across TableCodec and ColumnBlockReader to avoid build TableDefinition in column block reader.
• Optimize column-store build and read paths by reducing per-row allocations/copies).

[codecov]

Codecov Report

❌ Patch coverage is 60.29106% with 191 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.55%. Comparing base (30e7b51) to head (b391a9b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/table/encoding.cpp	62.80%	75 Missing and 15 partials ⚠️
src/btree/column_store/column_block_reader.cpp	39.06%	32 Missing and 7 partials ⚠️
src/btree/column_store/column_block_builder.cpp	71.27%	17 Missing and 10 partials ⚠️
src/table/table_column_store.cpp	60.86%	8 Missing and 10 partials ⚠️
src/btree/column_store/column_leaf_ops.cpp	19.04%	15 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #183      +/-   ##
==========================================
+ Coverage   52.36%   52.55%   +0.19%     
==========================================
  Files         157      157              
  Lines       11027    11181     +154     
  Branches     4752     4785      +33     
==========================================
+ Hits         5774     5876     +102     
- Misses       4524     4582      +58     
+ Partials      729      723       -6     

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