CIF Clean-Up

[LarsKue]

• Add type hints
• Use different defaults
• Fix compute_metrics signature
• Other minor changes

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 52.94118% with 16 lines in your changes missing coverage. Please review.

Project coverage is 54.04%. Comparing base (fbda19c) to head (22c1768).
Report is 8 commits behind head on dev.

Files with missing lines	Patch %	Lines
bayesflow/networks/cif/conditional_gaussian.py	37.50%	10 Missing ⚠️
bayesflow/networks/cif/cif.py	60.00%	6 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #186      +/-   ##
==========================================
- Coverage   54.04%   54.04%   -0.01%     
==========================================
  Files         140      140              
  Lines        3225     3229       +4     
==========================================
+ Hits         1743     1745       +2     
- Misses       1482     1484       +2     

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[Chase-Grajeda]

All looks good 👍🏻