EBTEL interface refactor

[wtbarnes]

Fixes #95

This reorganizes the EBTEL model interface to use the newly-reorganized ebtel++ Python interface. It also significantly refactors and simplifies the heating models used with ebtel.

TODOs:

• Tests for various heating models just to ensure they actually work (i.e. smoke tests)
• Example gallery for EBTEL and an "interesting" heating model

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 79.07950% with 50 lines in your changes missing coverage. Please review.

Project coverage is 51.14%. Comparing base (c45f6aa) to head (b87f3d9).

Files with missing lines	Patch %	Lines
synthesizAR/interfaces/ebtel/nei.py	28.57%	25 Missing ⚠️
synthesizAR/interfaces/ebtel/heating_models.py	84.68%	17 Missing ⚠️
synthesizAR/models/heating.py	44.44%	5 Missing ⚠️
synthesizAR/interfaces/ebtel/ebtel.py	97.05%	1 Missing ⚠️
synthesizAR/interfaces/hydrad/hydrad.py	80.00%	1 Missing ⚠️
synthesizAR/strand.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
+ Coverage   44.77%   51.14%   +6.36%     
==========================================
  Files          39       40       +1     
  Lines        2135     2100      -35     
==========================================
+ Hits          956     1074     +118     
+ Misses       1179     1026     -153     

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