WIP: Brute force method to find the optimal number of harmonics for WaveX, DMWaveX, and CMWaveX

[abhisrkckl]

Also moves [CM|DM]WaveX-related functions out of pint.utils (see #1804)

This PR depends on #1802, so it should be merged before merging this.

[codecov]

Codecov Report

Attention: Patch coverage is 69.62233% with 185 lines in your changes missing coverage. Please review.

Project coverage is 69.56%. Comparing base (8c9a689) to head (b66d989).
Report is 33 commits behind head on master.

Files	Patch %	Lines
src/pint/models/wavex.py	56.15%	35 Missing and 22 partials ⚠️
src/pint/noise_analysis.py	66.25%	51 Missing and 3 partials ⚠️
src/pint/models/cmwavex.py	80.69%	25 Missing and 14 partials ⚠️
src/pint/models/dmwavex.py	58.53%	13 Missing and 4 partials ⚠️
src/pint/models/timing_model.py	76.05%	12 Missing and 5 partials ⚠️
src/pint/utils.py	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1822      +/-   ##
==========================================
+ Coverage   69.48%   69.56%   +0.07%     
==========================================
  Files         108      110       +2     
  Lines       25106    25411     +305     
  Branches     4455     4515      +60     
==========================================
+ Hits        17445    17676     +231     
- Misses       6549     6611      +62     
- Partials     1112     1124      +12     

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