Disable bulk decompression for small limits

[akuzm]

It is about 10x faster than row-by-row decompression, so if we're going to decompress 10x less rows than the batch size, it's more efficient to decompress row-by-row.

In tsbench, this improves lateral join queries (asof-style) by 30%: https://grafana.ops.savannah-dev.timescale.com/d/fasYic_4z/compare-akuzm?orgId=1&var-branch=All&var-run1=3284&var-run2=3287&var-threshold=0&var-use_historical_thresholds=true&var-threshold_expression=2.5%20%2A%20percentile_cont%280.90%29&var-exact_suite_version=false

Disable-check: force-changelog-file

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 81.46%. Comparing base (59f50f2) to head (47d9c74).
Report is 50 commits behind head on main.

❗ Current head 47d9c74 differs from pull request most recent head b08ce74. Consider uploading reports for the commit b08ce74 to get more accurate results

Files	Patch %	Lines
tsl/src/planner.c	81.03%	6 Missing and 5 partials ⚠️
tsl/src/nodes/decompress_chunk/planner.c	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6666      +/-   ##
==========================================
+ Coverage   80.06%   81.46%   +1.40%     
==========================================
  Files         190      190              
  Lines       37181    36452     -729     
  Branches     9450     9470      +20     
==========================================
- Hits        29770    29697      -73     
+ Misses       2997     2983      -14     
+ Partials     4414     3772     -642     

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