Vectorized hash grouping by a single text column

[akuzm]

Use the UMASH hashes that have a guaranteed lower bound on collisions as the hash table keys.

[codecov]

Codecov Report

Attention: Patch coverage is 89.65517% with 6 lines in your changes missing coverage. Please review.

Project coverage is 81.85%. Comparing base (59f50f2) to head (7cd0424).
Report is 713 commits behind head on main.

Files with missing lines	Patch %	Lines
...des/vector_agg/hashing/hash_strategy_single_text.c	88.09%	1 Missing and 4 partials ⚠️
tsl/src/nodes/vector_agg/plan.c	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7586      +/-   ##
==========================================
+ Coverage   80.06%   81.85%   +1.78%     
==========================================
  Files         190      241      +51     
  Lines       37181    44558    +7377     
  Branches     9450    11115    +1665     
==========================================
+ Hits        29770    36473    +6703     
- Misses       2997     3698     +701     
+ Partials     4414     4387      -27     

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