JP-3576: Likelihood Algorithm Implementation in Ramp Fitting

[kmacdonald-stsci]

Resolves JP-3576

This PR addresses the implementation of the likelihood algorithm for ramp fitting developed by Timothy Brandt.

This is currently in draft form for feedback and for documentation.

Checklist

• [ ] added entry in CHANGES.rst (either in Bug Fixes or Changes to API)
• [ ] updated relevant tests
• [ ] updated relevant documentation
• [ ] updated relevant milestone(s)
• [ ] added relevant label(s)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 71.96496% with 224 lines in your changes missing coverage. Please review.

Project coverage is 82.58%. Comparing base (af5aefb) to head (5ebae9d). Report is 189 commits behind head on main.

Files with missing lines	Patch %	Lines
tests/test_ramp_fitting_likly_fit.py	65.38%	117 Missing :warning:
src/stcal/ramp_fitting/likely_fit.py	81.19%	60 Missing :warning:
src/stcal/ramp_fitting/likely_algo_classes.py	67.69%	42 Missing :warning:
src/stcal/ramp_fitting/ramp_fit.py	54.54%	5 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #264 +/- ## ========================================== - Coverage 85.18% 82.58% -2.61% ========================================== Files 35 38 +3 Lines 6797 7797 +1000 ========================================== + Hits 5790 6439 +649 - Misses 1007 1358 +351 ```

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