CAFDI-7 - Create Multi TLD Gravity Model MVP

[wsp-mbuckley]

Describe Changes

Add class to calibrate gravity model to multiple cost distributions.

• [x] CAFDI-20 - Move gravity and jacobian functions to single_Core
• [x] CAFDI-21 - implement multi_cost_distribution Class
• [x] CAFDI-25 - implement MultiGravityModelResults
• [x] CAFDI-22 - refactor _calibrate function
• [x] CAFDI-23 - implement _gravity_function
• [x] CAFDI-24 - implement _jacobian_function
• [x] CAFDI-26 - Write multiTLD tests for run
• [x] CAFDI-27 - Write tests for calibration
• [x] CAFDI-28 - Write tests for error checking

Task Checklist

• [x] Have unittests been added (testing individual functions and their edge cases)
• [x] Have integration tests been added (if applicable, to test modules of functionality)
• [x] Updated RELEASE.md to reflect changes in PR
• [x] Have new dependencies been added?
  • [x] Have they been added to either requirements.txt or requirements_dev.txt.
  • [ ] Have they been added to setup.cfg

[BenTaylor-TfN]

Finished #6 now. Also updated the packaging system in #8.

Rebased this off of the new main to keep the commit messages in here a bit clearer. No significant changes that you weren't already aware of.

[codecov[bot]]

Codecov Report

Attention: 89 lines in your changes are missing coverage. Please review.

Comparison is base (30e4c8c) 85.09% compared to head (e9672b2) 81.38%.

Files	Patch %	Lines
src/caf/distribute/gravity_model/multi_area.py	81.63%	36 Missing :warning:
src/caf/distribute/gravity_model/core.py	26.66%	22 Missing :warning:
src/caf/distribute/gravity_model/single_area.py	82.75%	20 Missing :warning:
src/caf/distribute/utils.py	52.17%	11 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #7 +/- ## ========================================== - Coverage 85.09% 81.38% -3.71% ========================================== Files 7 9 +2 Lines 416 634 +218 ========================================== + Hits 354 516 +162 - Misses 62 118 +56 ```

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[isaac-tfn]

@BenTaylor-TfN I think I've made those changes now