Support regulariser with multi model particle filter

[sdhiscocks]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 90.47619% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 93.55%. Comparing base (8c8f9ee) to head (068adf6).

Files	Patch %	Lines
stonesoup/updater/particle.py	85.71%	2 Missing and 2 partials :warning:
stonesoup/regulariser/particle.py	94.28%	1 Missing and 1 partial :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #979   +/-   ##
=======================================
  Coverage   93.54%   93.55%           
=======================================
  Files         202      202           
  Lines       12930    12977   +47     
  Branches     2640     2651   +11     
=======================================
+ Hits        12096    12140   +44     
  Misses        590      590           
- Partials      244      247    +3     

Flag	Coverage Δ
integration	65.87% <15.87%> (-0.17%)	:arrow_down:
unittests	89.19% <90.47%> (-0.02%)	:arrow_down:

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