feat: support multiplex SQ

[BubbleCal]

Benchmarking L2(uint8, scalar): Warming up for 3.0000 s
Warning: Unable to complete 10 samples in 5.0s. You may wish to increase target time to 12.9s.
L2(uint8, scalar)       time:   [1.2831 s 1.2838 s 1.2845 s]
                        change: [-0.0534% +0.0802% +0.2032%] (p = 0.26 > 0.10)
                        No change in performance detected.

Benchmarking L2(uint8, w/o-scale: Warming up for 3.0000 s
Warning: Unable to complete 10 samples in 5.0s. You may wish to increase target time to 12.7s.
L2(uint8, w/o-scale     time:   [1.2745 s 1.2755 s 1.2765 s]
                        change: [-0.0110% +0.1064% +0.2293%] (p = 0.11 > 0.10)
                        No change in performance detected.

this doesn't introduce significant performance reduction

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.15044% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 80.78%. Comparing base (00cda83) to head (0a150b2).

Files	Patch %	Lines
rust/lance-index/src/vector/sq/storage.rs	55.00%	9 Missing ⚠️
rust/lance/src/index/vector/sq.rs	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2252      +/-   ##
==========================================
- Coverage   80.80%   80.78%   -0.02%     
==========================================
  Files         192      192              
  Lines       56189    56223      +34     
  Branches    56189    56223      +34     
==========================================
+ Hits        45403    45422      +19     
- Misses       8117     8134      +17     
+ Partials     2669     2667       -2     

Flag	Coverage Δ
unittests	80.78% <91.15%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.