Geometric input params

[aabills]

Description

This pull request implements a SymbolicUniform1DSubmesh, which allows for geometric parameters, such as electrode thicknesses and particle sizes to be pybamm.InputParameter's.

Fixes #3649

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 -m pytest (or $ nox -s tests)
• The documentation builds: $ python -m pytest --doctest-plus src (or $ nox -s doctests)

You can run integration tests, unit tests, and doctests together at once, using $ 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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.25%. Comparing base (a7253b8) to head (b46abfc).
Report is 134 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4665      +/-   ##
===========================================
+ Coverage    99.22%   99.25%   +0.02%     
===========================================
  Files          303      303              
  Lines        23070    23223     +153     
===========================================
+ Hits         22891    23049     +158     
+ Misses         179      174       -5     

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[rtimms]

thanks @aabills looks great, just a few comments

[brosaplanella]

Sorry, got late to the review, but that's great! Tagging @BradyPlanden as this will be relevant to PyBOP.

[aabills]

Do reach out to me if you are interested in using it, it doesn't work with the "out of the box" pybamm models but its relatively straightforward to get it working with custom models