feat(java): support create scalar indexes

[LuQQiu]

Support create scalar indexes

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 1.20482% with 82 lines in your changes missing coverage. Please review.

Project coverage is 77.96%. Comparing base (9c42903) to head (5e500c1).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
java/core/lance-jni/src/utils.rs	0.00%	82 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2832      +/-   ##
==========================================
+ Coverage   77.94%   77.96%   +0.01%     
==========================================
  Files         229      229              
  Lines       70147    70376     +229     
  Branches    70147    70376     +229     
==========================================
+ Hits        54679    54868     +189     
- Misses      12393    12414      +21     
- Partials     3075     3094      +19     

Flag	Coverage Δ
unittests	77.96% <1.20%> (+0.01%)	⬆️

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[LuQQiu]

@wjones127 @westonpace PTAL, thanks!