Adding an example of extended object tracking (EOT)

[A-acuto]

This PR adds an example showing how to use Stone Soup components for a multi target extended object tracking scenario.

This example assumes that multiple detections are generated by each target at each timestep, by randomly drawing samples from an extended shape (ellipse in this case) and then employs a clustering algorithm to process the multiple detections and generate a new set of detections for performing the tracking duties.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.49%. Comparing base (10e26e0) to head (909449d).
Report is 39 commits behind head on main.

Additional details and impacted files

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- Coverage   93.52%   93.49%   -0.04%     
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  Files         201      201              
  Lines       12835    12835              
  Branches     2629     2629              
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- Hits        12004    12000       -4     
- Misses        587      590       +3     
- Partials      244      245       +1     

Flag	Coverage Δ
integration	66.25% <ø> (-0.03%)	⬇️
unittests	89.12% <ø> (ø)

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