Ensemble faster-rcnn detectors

[sfmig]

Description

In this PR

• ensemble model for inference (supports detectors under torchvision.models.detection)
• module for fusing bboxes

References

Please reference any existing issues/PRs that relate to this PR.

How has this PR been tested?

Please explain how any new code has been tested, and how you have ensured that no existing functionality has changed.

Is this a breaking change?

If this PR breaks any existing functionality, please explain how and why.

Does this PR require an update to the documentation?

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documentation has been updated.

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

[codecov]

Codecov Report

❌ Patch coverage is 9.67742% with 168 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.01%. Comparing base (a34f1f6) to head (b34680d).

Files with missing lines	Patch %	Lines
ethology/detectors/ensembles/fusion.py	0.00%	97 Missing ⚠️
ethology/detectors/ensembles/models.py	0.00%	71 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #114       +/-   ##
===========================================
- Coverage   99.46%   77.01%   -22.45%     
===========================================
  Files           8       11        +3     
  Lines         558      744      +186     
===========================================
+ Hits          555      573       +18     
- Misses          3      171      +168     

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