Volume fractions and porosity that vary in y and z

[DrSOKane]

Added support for porosity and active material volume fractions that vary in y and z, not just x. It appears to work for the z coordinate ("dimensionality": 1) but the y coordinate appears to get replaced with the StateVector between experiment steps. I tried changing all instances of y in lithium_ion_parameters.py to y_cc but that didn't change anything.

Added an example graded_pouch.py to show that it works in one dimension.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 98.69%. Comparing base (6ff7848) to head (4dfc96c). :warning: Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #5214   +/-   ##
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  Coverage    98.69%   98.69%           
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  Files          324      324           
  Lines        28010    28016    +6     
========================================
+ Hits         27645    27651    +6     
  Misses         365      365           

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