Add example Scala project

[will-molloy]

Also moved Kotlin/Scala to subprojects rather than applying to all.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.71%. Comparing base (158acaf) to head (5783165).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ala/src/main/scala/com/willmolloy/HelloScala.scala	50.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##                main     #246       +/-   ##
==============================================
- Coverage     100.00%   85.71%   -14.29%     
+ Complexity         5        4        -1     
==============================================
  Files              2        3        +1     
  Lines              6        7        +1     
==============================================
  Hits               6        6               
- Misses             0        1        +1     

Flag	Coverage Δ
integration-tests-macos-latest	100.00% <100.00%> (ø)
integration-tests-ubuntu-latest	100.00% <100.00%> (ø)
integration-tests-windows-latest	100.00% <100.00%> (ø)
unit-tests-macos-latest	85.71% <75.00%> (-14.29%)	⬇️
unit-tests-ubuntu-latest	85.71% <75.00%> (-14.29%)	⬇️
unit-tests-windows-latest	85.71% <75.00%> (-14.29%)	⬇️

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