Time space dependent trap density

[RemDelaporteMathurin]

Proposed changes

Implemented a time and space dependent trap density #644

Types of changes

What types of changes does your code introduce to FESTIM?

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code refactoring
• Documentation Update (if none of the other choices apply)
• New tests

Checklist

• Black formatted
• Unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[codecov]

Codecov Report

Attention: Patch coverage is 47.61905% with 22 lines in your changes missing coverage. Please review.

Project coverage is 97.05%. Comparing base (3fc02da) to head (bc4636b).
Report is 226 commits behind head on fenicsx.

Files with missing lines	Patch %	Lines
festim/species.py	36.36%	21 Missing ⚠️
festim/hydrogen_transport_problem.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           fenicsx     #782      +/-   ##
===========================================
- Coverage    98.39%   97.05%   -1.34%     
===========================================
  Files           28       28              
  Lines         1554     1594      +40     
===========================================
+ Hits          1529     1547      +18     
- Misses          25       47      +22     

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[RemDelaporteMathurin]

Closing in favour of #886