Enhancement: Tidy the plotting library

[RHammond2]

This PR brings the entire openoa/utils/plot.py up to spec with later implemented best practices to ensure that figures can be customized in the methods to suit most needs for publication or presentation, or return the matplotlib objects back to add the final touches.

Given that plot_windfarm was added at a later point in time and is much cleaner, plot_array has been deprecated entirely. However, the following have been removed as a byproduct of their original intent being lost and their usage being unclear:

• plot_array
• subplot_powerRose_array
• powerRose_array
• subplot_c1_c2
• subplot_c1_c2_flagged
• subplot_c1_c2_raw_flagged
• subplt_power_curve
• turbine_polar_line
• turbine_polar_4Dscatter
• turbine_polar_contourf
• turbine_polar_contour

This PR closes #251.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 8.33333% with 22 lines in your changes missing coverage. Please review.

Project coverage is 65.50%. Comparing base (daf42ac) to head (371c4f2).

Files with missing lines	Patch %	Lines
openoa/utils/plot.py	8.33%	22 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           develop_v3     #253      +/-   ##
==============================================
+ Coverage       61.85%   65.50%   +3.64%     
==============================================
  Files              29       29              
  Lines            4315     4061     -254     
==============================================
- Hits             2669     2660       -9     
+ Misses           1646     1401     -245     

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[ejsimley]

This looks good to me! Thanks for adding more flexibility to plot.plot_by_id and using that in the yaw misalignment example!