Add ChernoffUpdater class and track feeder

[ekhunter123]

Following the work done in the example in my latest pull request #666, we've made standalone classes for the ChernoffUpdater and the Tracks2GaussianDetectionFeeder. I'd love any feedback or suggestions, thank you!

Thanks to @sdhiscocks for the help in designing and writing these classes!

Sample usages of both these classes can be seen in the example #666 .

[codecov[bot]]

Codecov Report

Merging #681 (6af1d89) into main (f36afad) will decrease coverage by 0.00%. The diff coverage is 92.68%.

:exclamation: Current head 6af1d89 differs from pull request most recent head 9d5a246. Consider uploading reports for the commit 9d5a246 to get more accurate results

@@            Coverage Diff             @@
##             main     #681      +/-   ##
==========================================
- Coverage   94.59%   94.58%   -0.01%     
==========================================
  Files         168      170       +2     
  Lines        8516     8557      +41     
  Branches     1652     1658       +6     
==========================================
+ Hits         8056     8094      +38     
- Misses        342      343       +1     
- Partials      118      120       +2     

Flag	Coverage Δ
integration	68.27% <0.00%> (-0.33%)	:arrow_down:
unittests	92.10% <92.68%> (+<0.01%)	:arrow_up:

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Impacted Files	Coverage Δ
stonesoup/updater/chernoff.py	92.30% <92.30%> (ø)
stonesoup/feeder/track.py	93.33% <93.33%> (ø)

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