Mesh properties fdim and vdim

[jhdark]

Proposed changes

The mesh with this change will have the properties fdim - facet dimension and vdim - the cell dimension which can then be accessed later.

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)

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (dcb3b8c) 93.98% compared to head (54d9f21) 94.08%.

Additional details and impacted files

@@             Coverage Diff             @@
##           fenicsx     #599      +/-   ##
===========================================
+ Coverage    93.98%   94.08%   +0.09%     
===========================================
  Files            9        9              
  Lines          183      186       +3     
===========================================
+ Hits           172      175       +3     
  Misses          11       11              

Files	Coverage Δ
festim/hydrogen_transport_problem.py	96.62% <100.00%> (-0.08%)	⬇️
festim/mesh/mesh.py	100.00% <100.00%> (ø)
festim/mesh/mesh_1d.py	100.00% <100.00%> (ø)

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[jhdark]

If you're happy with this @RemDelaporteMathurin I'll merge

[RemDelaporteMathurin]

LGTM