Sei composite multiparticle

[aabills]

Description

make sei work with particle size distributions

Fixes # (issue)

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

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Codecov Report

Attention: Patch coverage is 79.47020% with 31 lines in your changes missing coverage. Please review.

Project coverage is 99.08%. Comparing base (864388f) to head (83264a1).
Report is 8 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../pybamm/parameters/size_distribution_parameters.py	38.09%	13 Missing ⚠️
src/pybamm/expression_tree/averages.py	63.15%	7 Missing ⚠️
.../submodels/active_material/base_active_material.py	60.00%	4 Missing ⚠️
src/pybamm/geometry/battery_geometry.py	66.66%	2 Missing ⚠️
src/pybamm/parameters/geometric_parameters.py	71.42%	2 Missing ⚠️
...ybamm/models/submodels/interface/base_interface.py	93.33%	1 Missing ⚠️
...s/submodels/interface/total_interfacial_current.py	75.00%	1 Missing ⚠️
.../pybamm/models/submodels/porosity/base_porosity.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4693      +/-   ##
===========================================
- Coverage    99.21%   99.08%   -0.14%     
===========================================
  Files          302      302              
  Lines        22880    22996     +116     
===========================================
+ Hits         22701    22786      +85     
- Misses         179      210      +31     

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