perf: lazy load loguru.logger to speed up cli -h

[joanise]

EveryVoiceTTS/EveryVoice#840

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
fs2/variance_adaptor.py	52% smaller
fs2/cli/check_data.py	0% smaller
fs2/cli/preprocess.py	0% smaller
fs2/cli/synthesize.py	0% smaller
fs2/cli/train.py	0% smaller
fs2/model.py	0% smaller
fs2/prediction_writing_callback.py	0% smaller

[codecov]

Codecov Report

❌ Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.42%. Comparing base (22272e5) to head (193ccc6).

Files with missing lines	Patch %	Lines
fs2/cli/check_data.py	0.00%	2 Missing ⚠️
fs2/cli/preprocess.py	0.00%	1 Missing ⚠️
fs2/cli/train.py	0.00%	1 Missing ⚠️
fs2/variance_adaptor.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #150      +/-   ##
==========================================
- Coverage   47.52%   47.42%   -0.11%     
==========================================
  Files          27       27              
  Lines        1978     1978              
  Branches      224      224              
==========================================
- Hits          940      938       -2     
- Misses       1002     1004       +2     
  Partials       36       36              

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