Scale points for Voronoi plots

[NicolaCourtier]

Description

To cope with the very different scales of typical battery parameters, update the surface plot to (by default) compute the Voronoi regions based on a dimensionless parameter space normalised with respect to the bounds.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.17%. Comparing base (c8b00e6) to head (340b23b).
Report is 35 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #587      +/-   ##
===========================================
+ Coverage    99.08%   99.17%   +0.09%     
===========================================
  Files           52       56       +4     
  Lines         3605     4008     +403     
===========================================
+ Hits          3572     3975     +403     
  Misses          33       33              

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[BradyPlanden]

Thanks for the update @NicolaCourtier - just a few comments.

[BradyPlanden]

Looks good, thanks @NicolaCourtier - I've added a small patch for the failing multistart unit test. I think this should solve the issue, but I can't replicate it on my local machine at the moment.