Add isort

[BenTaylor-TfN]

Describe Changes

Adding isort as a linter

Task Checklist

• [ ] Have unittests been added (testing individual functions and their edge cases)
• [ ] 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.
  • [x] Have they been added to pyproject.toml

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📚 Documentation preview 📚: https://caftoolkit--96.org.readthedocs.build/en/96/

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (c040150) 93.26% compared to head (6c53869) 93.15%. Report is 2 commits behind head on main.

Files	Patch %	Lines
...caf/toolkit/concurrency/multiprocessing_wrapper.py	75.00%	1 Missing :warning:
src/caf/toolkit/cost_utils.py	75.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #96 +/- ## ========================================== - Coverage 93.26% 93.15% -0.11% ========================================== Files 22 22 Lines 1573 1535 -38 ========================================== - Hits 1467 1430 -37 + Misses 106 105 -1 ```

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