Add scala3 support for the java module

[regadas]

@RustedBones I think this can work?

[codecov[bot]]

Codecov Report

Merging #678 (edf8270) into main (9a3b3bb) will decrease coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #678      +/-   ##
==========================================
- Coverage   97.36%   97.36%   -0.01%     
==========================================
  Files          57       57              
  Lines        1706     1705       -1     
  Branches      129      129              
==========================================
- Hits         1661     1660       -1     
  Misses         45       45              

Impacted Files	Coverage Δ
.../main/scala/com/spotify/featran/java/JavaOps.scala	100.00% <100.00%> (ø)

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