Fitter refactored

[ramav87]

SidpyFitterRefactored Class - SidpyFitter had issues with graph creation (did not work for large datasets; exploded and failed). This refactored class solves that problem. But this will sit alongside the SidpyFitter until the features below are implemented/tested.

TODO:

• make the output a sidpy dataset (it’s still dask),
• and enable generation of a fit dataset,
• Return covariances,
• Add robust fit methods (adjust the existing objective fn)
• Test on 2D fits

[codecov-commenter]

Codecov Report

❌ Patch coverage is 93.22034% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.10%. Comparing base (a289a80) to head (d2e4a60).

Files with missing lines	Patch %	Lines
sidpy/proc/fitter_refactor.py	90.54%	19 Missing ⚠️
tests/proc/fitter_function_utils.py	91.55%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #225      +/-   ##
==========================================
+ Coverage   75.27%   76.10%   +0.83%     
==========================================
  Files          48       51       +3     
  Lines       10639    11108     +469     
==========================================
+ Hits         8008     8454     +446     
- Misses       2631     2654      +23     

Flag	Coverage Δ
unittests	76.10% <93.22%> (+0.83%)	⬆️

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