[ENH] - Update Modes management to use sub-object attributes rather than inheritance

[TomDonoghue]

Interim update to set objects to use sub-objects as attributes, rather than inheriting everything into singular objects.

Merged into sub-branch for checking there before integrating to main.

[codecov]

Codecov Report

Attention: Patch coverage is 97.85553% with 19 lines in your changes missing coverage. Please review.

Project coverage is 97.23%. Comparing base (9f5de2e) to head (32cf001).
Report is 29 commits behind head on modes.

Files with missing lines	Patch %	Lines
specparam/objs/utils.py	0.00%	4 Missing ⚠️
specparam/modes/modes.py	83.33%	3 Missing ⚠️
specparam/algorithms/spectral_fit.py	97.50%	1 Missing ⚠️
specparam/measures/gof.py	0.00%	1 Missing ⚠️
specparam/models/event.py	93.33%	1 Missing ⚠️
specparam/models/group.py	85.71%	1 Missing ⚠️
specparam/models/time.py	88.88%	1 Missing ⚠️
specparam/modes/mode.py	0.00%	1 Missing ⚠️
specparam/objs/base.py	99.36%	1 Missing ⚠️
specparam/objs/metrics.py	97.67%	1 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##            modes     #354      +/-   ##
==========================================
- Coverage   97.24%   97.23%   -0.01%     
==========================================
  Files         135      141       +6     
  Lines        5728     5867     +139     
==========================================
+ Hits         5570     5705     +135     
- Misses        158      162       +4     

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