Export implicit species

[RemDelaporteMathurin]

Proposed changes

Fixes #781
Requires #782

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

All modified and coverable lines are covered by tests ✅

Project coverage is 98.39%. Comparing base (3fc02da) to head (3fc02da).
Report is 19 commits behind head on fenicsx.

❗ Current head 3fc02da differs from pull request most recent head b31a8a0

Please upload reports for the commit b31a8a0 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff            @@
##           fenicsx     #783   +/-   ##
========================================
  Coverage    98.39%   98.39%           
========================================
  Files           28       28           
  Lines         1554     1554           
========================================
  Hits          1529     1529           
  Misses          25       25           

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