fix: support fp16 type in SQ

[chebbyChefNEQ]

dynamically check for query type before quantizing to SQ codes

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 11.11111% with 16 lines in your changes missing coverage. Please review.

Project coverage is 78.82%. Comparing base (5a92d31) to head (e21d06d).

Files with missing lines	Patch %	Lines
rust/lance/src/io/exec/knn.rs	0.00%	14 Missing ⚠️
rust/lance-index/src/vector/sq/storage.rs	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3417      +/-   ##
==========================================
+ Coverage   78.77%   78.82%   +0.04%     
==========================================
  Files         250      250              
  Lines       91304    91306       +2     
  Branches    91304    91306       +2     
==========================================
+ Hits        71929    71974      +45     
+ Misses      16417    16378      -39     
+ Partials     2958     2954       -4     

Flag	Coverage Δ
unittests	78.82% <11.11%> (+0.04%)	⬆️

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