refactor: remove loguru

[tlambert03]

closes #238

we don't use many of the loguru features, and it brings on an unneeded extra dependency, and the possibility of conflict with stdlib logging

[codecov]

Codecov Report

Patch coverage: 86.15% and project coverage change: +0.04% 🎉

Comparison is base (f098e60) 86.63% compared to head (d8b244f) 86.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #239      +/-   ##
==========================================
+ Coverage   86.63%   86.67%   +0.04%     
==========================================
  Files          31       31              
  Lines        2259     2274      +15     
==========================================
+ Hits         1957     1971      +14     
- Misses        302      303       +1     

Files Changed	Coverage Δ
src/pymmcore_plus/_util.py	83.63% <20.00%> (ø)
src/pymmcore_plus/core/_mmcore_plus.py	89.08% <66.66%> (ø)
src/pymmcore_plus/_logger.py	81.81% <90.90%> (+2.22%)	⬆️
src/pymmcore_plus/_cli.py	93.18% <100.00%> (ø)
src/pymmcore_plus/mda/_engine.py	94.82% <100.00%> (ø)
src/pymmcore_plus/mda/_runner.py	92.42% <100.00%> (+0.63%)	⬆️

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