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]

Codecov Report

Attention: Patch coverage is 26.71233% with 749 lines in your changes missing coverage. Please review.

Project coverage is 95.59%. Comparing base (34186fe) to head (109a220).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/pybamm/spatial_methods/finite_volume_2d.py	18.34%	650 Missing ⚠️
src/pybamm/meshes/meshes.py	37.25%	32 Missing ⚠️
src/pybamm/discretisations/discretisation.py	45.71%	19 Missing ⚠️
src/pybamm/meshes/two_dimensional_submeshes.py	76.38%	17 Missing ⚠️
src/pybamm/expression_tree/vector_field.py	31.81%	15 Missing ⚠️
src/pybamm/solvers/processed_variable.py	40.00%	6 Missing ⚠️
src/pybamm/expression_tree/unary_operators.py	62.50%	3 Missing ⚠️
src/pybamm/parameters/parameter_values.py	40.00%	3 Missing ⚠️
src/pybamm/solvers/solution.py	25.00%	3 Missing ⚠️
src/pybamm/meshes/one_dimensional_submeshes.py	92.85%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5002      +/-   ##
===========================================
- Coverage    98.57%   95.59%   -2.98%     
===========================================
  Files          304      307       +3     
  Lines        23645    24654    +1009     
===========================================
+ Hits         23309    23569     +260     
- Misses         336     1085     +749     

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