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

Attention: Patch coverage is 71.75573% with 37 lines in your changes missing coverage. Please review.

Project coverage is 99.06%. Comparing base (a7253b8) to head (1a606b8).
Report is 8 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/pybamm/spatial_methods/finite_volume.py	65.85%	28 Missing ⚠️
src/pybamm/meshes/meshes.py	68.96%	9 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4665      +/-   ##
===========================================
- Coverage    99.22%   99.06%   -0.16%     
===========================================
  Files          303      303              
  Lines        23070    23195     +125     
===========================================
+ Hits         22891    22979      +88     
- Misses         179      216      +37     

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