refactor: remove PSYGNAL_UNCOMPILED flag.

[tlambert03]

the PSYGNAL_UNCOMPILED flag tries to allow the user to run psygnal in an uncompiled version by screwing with the import system.

It's buggy and problematic. This removes it and adds two utility functions decompile and recompile. All they do is rename the .so/.pyd files so as to make them unusuable/usable.

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (2179ebc) compared to base (aecc202).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #183   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines         1542      1536    -6     
=========================================
- Hits          1542      1536    -6     

Impacted Files	Coverage Δ
src/psygnal/__init__.py	100.00% <100.00%> (ø)
src/psygnal/_evented_decorator.py	100.00% <100.00%> (ø)
src/psygnal/utils.py	100.00% <100.00%> (ø)

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[codspeed-hq]

CodSpeed Performance Report

Merging #183 uncompiled (2179ebc) will not alter performances.

Summary

🔥 0 improvements
❌ 0 regressions
✅ 58 untouched benchmarks

🆕 0 new benchmarks
⁉️ 0 dropped benchmarks