2D FVM

[aabills]

Description

This pull request contains a 2D finite volume spatial method. It will be a WIP for a bit, making a draft for sharing purposes.

Fixes # (issue)

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #)

Important checks:

Please confirm the following before marking the PR as ready for review:

• No style issues: nox -s pre-commit
• All tests pass: nox -s tests
• The documentation builds: nox -s doctests
• Code is commented for hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov[bot]]

Codecov Report

:x: Patch coverage is 95.92593% with 11 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 98.23%. Comparing base (f04a1f8) to head (9d0a2c3). :warning: Report is 177 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/pybamm/solvers/processed_variable.py	43.75%	9 Missing :warning:
src/pybamm/discretisations/discretisation.py	98.21%	1 Missing :warning:
src/pybamm/meshes/meshes.py	98.03%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5002      +/-   ##
===========================================
- Coverage    99.09%   98.23%   -0.87%     
===========================================
  Files          306      309       +3     
  Lines        23659    24972    +1313     
===========================================
+ Hits         23446    24531    +1085     
- Misses         213      441     +228     

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