[PLOTLY] Support Objective Functions from Multiple Optimizations

[SimonBoothroyd]

Description

This PR adds support for plotting objective functions from multiple optimisations on the same plot with the plotly backend.

Status

• Ready to go

[codecov]

Codecov Report

Merging #48 (2426830) into master (c2c2889) will decrease coverage by 0.04%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
- Coverage   98.50%   98.46%   -0.05%     
==========================================
  Files          90       90              
  Lines        4026     4037      +11     
==========================================
+ Hits         3966     3975       +9     
- Misses         60       62       +2     

Impacted Files	Coverage Δ
nonbonded/backend/api/dev/endpoints/plotly.py	73.17% <0.00%> (ø)
nonbonded/library/plotting/plotly/optimization.py	92.00% <88.23%> (-8.00%)	⬇️

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