Add CLEAR MOT MetricGenerator

[kopytjuk]

This PR follows #1017 - where the association described in [1] is implemented.

Now we compute the actual MOTP and MOTA metrics:

[1] Evaluating Multiple Object Tracking Performance: The CLEAR MOT Metrics, Bernardin et al, 2008

[codecov]

Codecov Report

Attention: Patch coverage is 96.46018% with 4 lines in your changes missing coverage. Please review.

Project coverage is 94.33%. Comparing base (4b6bd37) to head (14b04e0).
Report is 119 commits behind head on main.

Files with missing lines	Patch %	Lines
stonesoup/metricgenerator/clearmotmetrics.py	96.46%	1 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1068      +/-   ##
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+ Coverage   94.31%   94.33%   +0.01%     
==========================================
  Files         208      209       +1     
  Lines       13603    13716     +113     
  Branches     2767     2790      +23     
==========================================
+ Hits        12830    12939     +109     
- Misses        522      523       +1     
- Partials      251      254       +3     

Flag	Coverage Δ
integration	66.84% <25.66%> (-0.35%)	⬇️
unittests	90.47% <96.46%> (+0.04%)	⬆️

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[kopytjuk]

Hey @sdhiscocks, since you reviewed a precursor PR on the associator logic - could you please take a look on this PR, which implements the actual metric?

[sdhiscocks]

Thanks for the contribution. Looks good to me, with some minor suggestions. 👍

Will also need to add docs/source/stonesoup.metricgenerator.tracktotruthmetrics.rst file and toc tree entry in docs/source/stonesoup.metricgenerator.rst for docs to generate.

[kopytjuk]

Thanks for the contribution. Looks good to me, with some minor suggestions. 👍

Will also need to add docs/source/stonesoup.metricgenerator.tracktotruthmetrics.rst file and toc tree entry in docs/source/stonesoup.metricgenerator.rst for docs to generate.

Done! Have also slightly adapted the class docstring for making it more consice and less verbose!