Try even lazier decompression

[akuzm]

Decompress in vectorized aggregation code when the column is required. This improves cache locality.

[codecov]

Codecov Report

Attention: Patch coverage is 68.33333% with 19 lines in your changes missing coverage. Please review.

Project coverage is 81.89%. Comparing base (59f50f2) to head (a21f936).
Report is 797 commits behind head on main.

Files with missing lines	Patch %	Lines
tsl/src/nodes/decompress_chunk/compressed_batch.c	69.81%	1 Missing and 15 partials ⚠️
tsl/src/nodes/vector_agg/grouping_policy_batch.c	0.00%	0 Missing and 2 partials ⚠️
tsl/src/nodes/vector_agg/grouping_policy_hash.c	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7782      +/-   ##
==========================================
+ Coverage   80.06%   81.89%   +1.82%     
==========================================
  Files         190      247      +57     
  Lines       37181    45467    +8286     
  Branches     9450    11369    +1919     
==========================================
+ Hits        29770    37235    +7465     
- Misses       2997     3754     +757     
- Partials     4414     4478      +64     

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