Fix slots codegen, improve test diagnostics.

[Jeffset]

Refactor + Fix: Refactor slot switch generator.

Fixes the hardcoded 100 slots (whoops!)
Uses chunked() call for much clearer code.

Testing: Print full compiler diagnostics.

This improves test code debugging experience.

---

No golden diff, no tests changed => No actual behavior is changed.

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 83.89%. Comparing base (f07a196) to head (e06dad1).

Files	Patch %	Lines
...dex/yatagan/codegen/impl/SlotSwitchingGenerator.kt	94.73%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #149      +/-   ##
============================================
- Coverage     83.90%   83.89%   -0.02%     
+ Complexity     1577     1575       -2     
============================================
  Files           191      191              
  Lines          7686     7675      -11     
  Branches       1428     1427       -1     
============================================
- Hits           6449     6439      -10     
  Misses          732      732              
+ Partials        505      504       -1     

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