Allow lists of input parameters as initial conditions

[pipliggins]

Description

Input parameters should not be able to be used as initial conditions (see #1261), but a bug was present where if more than one input parameter was provided but not all were used as initial conditions, the error warning could be bypassed.

Allows input parameters used as initial conditions to be included within lists of inputs to the solver by converting model.y0 to model.y0_list, and calculating one initial state per input parameter set.

This rolls back a lot of the changes made by #4981 as the functionality is added to all the solvers; the initial_conditions argument added for IDAKLU has been removed in favour of allowing all inputs to be included within inputs.

Fixes #5154
Fixes #5131

[codecov]

Codecov Report

❌ Patch coverage is 98.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.79%. Comparing base (73ab559) to head (789e717).

Files with missing lines	Patch %	Lines
src/pybamm/solvers/base_solver.py	98.18%	2 Missing ⚠️
src/pybamm/models/base_model.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5191      +/-   ##
===========================================
+ Coverage    98.77%   98.79%   +0.02%     
===========================================
  Files          321      321              
  Lines        27729    27707      -22     
===========================================
- Hits         27389    27373      -16     
+ Misses         340      334       -6     

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[rtimms]

Does this still allow for the case where there is an InputParameter in the initial conditions but there is only one solver? I.e. there is just a dict of inputs not a list of dicts. That case should still work IMO.

[pipliggins]

Does this still allow for the case where there is an InputParameter in the initial conditions but there is only one solver? I.e. there is just a dict of inputs not a list of dicts. That case should still work IMO.

Still works; going to edit this PR actually to make it a new feature that a list of input parameters can be provided and the inputs will be distributed correctly (useful for PyBoP).

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[martinjrobins]

sorry for the delay on this @pipliggins. The rest of the tests look good, just those comments above