chore: cleanup mypy config

[Saransh-cpp]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #3489

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• [ ] New feature (non-breaking change which adds functionality)
• [ ] Optimization (back-end change that speeds up the code)
• [ ] Bug fix (non-breaking change which fixes an issue)

Key checklist:

• [ ] No style issues: $ pre-commit run (or $ nox -s pre-commit) (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• [ ] All tests pass: $ python run-tests.py --all (or $ nox -s tests)
• [ ] The documentation builds: $ python run-tests.py --doctest (or $ nox -s doctests)

You can run integration tests, unit tests, and doctests together at once, using $ python run-tests.py --quick (or $ nox -s quick).

Further checks:

• [ ] Code is commented, particularly in hard-to-understand areas
• [ ] Tests added that prove fix is effective or that feature works

[agriyakhetarpal]

Note: when ready, this PR should close https://github.com/pybamm-team/PyBaMM/issues/3489, since setting up the type checking configurations was the only remaining task on the list.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.60%. Comparing base (2f9f1e2) to head (a7abf91).

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #3853    +/-   ##
=========================================
  Coverage    99.60%   99.60%            
=========================================
  Files          259      259            
  Lines        21284    21480   +196     
=========================================
+ Hits         21200    21396   +196     
  Misses          84       84            

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[Saransh-cpp]

Adding the isort rule blowed up this PR. I'll exclude examples from the isort rule.

[kratman]

@Saransh-cpp This is pretty old, can we close it since the work would likely have to be redone?

[Saransh-cpp]

Hi, yes. There are a ton of conflicts and it would just be better to start this PR from scratch. Thanks for the ping!