Add a 'partial' model type

[pipliggins]

Fixes #40

Adds 'Partial' as a model option, which rules that all the top-level parameters (cell, electrodes, separator, electrolyte, user-defined) are optional, along with the 'State' section. Any parameter group (e.g. Cell) provided must be complete.

Checks that:

1. If both electrodes are specified, they are of the same type (i.e. both SPM or both full)
2. If one or more electrodes are SPM, then 'full' parameters (electrolyte & separator) are not provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.21429% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@22d8f3b). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
bpx/schema.py	98.21%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #115   +/-   ##
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  Coverage        ?   96.73%           
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  Files           ?        9           
  Lines           ?      460           
  Branches        ?       47           
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  Hits            ?      445           
  Misses          ?        7           
  Partials        ?        8           

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[martinjrobins]

code looks good to me, thanks @pipliggins. I'll let @rtimms check the match with the published schema

[rtimms]

thanks @pipliggins LGTM! Could you update the changelog, please?

[pipliggins]

thanks @pipliggins LGTM! Could you update the changelog, please?

Done @rtimms - If a partial schema is defined, should the State section introduced in #113 then be optional? If so it might be easier to merge that one first, then I can make the required changes here before merging this one.

[pipliggins]

thanks @pipliggins LGTM! Could you update the changelog, please?

Done @rtimms - If a partial schema is defined, should the State section introduced in #113 then be optional? If so it might be easier to merge that one first, then I can make the required changes here before merging this one.

The 'State' section introduced by #113 is now optional for partial models, with a custom check to ensure it's present for anything other than model='partial'

[rtimms]

@pipliggins great, thanks!