BBM rheology

[simone-silvestri]

This PR depends on #55 and introduces the BBM rheology. It is here for the moment to render the examples using BBM, but requires a bit more work.

[codecov]

Codecov Report

Attention: Patch coverage is 40.83969% with 155 lines in your changes missing coverage. Please review.

Project coverage is 63.43%. Comparing base (f22a998) to head (c5cc4c3).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Rheologies/brittle_bingham_maxwell_rheology.jl	0.00%	117 Missing ⚠️
src/tracer_tendency_kernel_functions.jl	23.52%	13 Missing ⚠️
src/sea_ice_advection.jl	50.00%	11 Missing ⚠️
...SeaIceMomentumEquations/sea_ice_external_stress.jl	0.00%	6 Missing ⚠️
src/Rheologies/viscous_rheology.jl	60.00%	4 Missing ⚠️
src/sea_ice_time_stepping.jl	62.50%	3 Missing ⚠️
src/Rheologies/elasto_visco_plastic_rheology.jl	97.67%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
- Coverage   70.71%   63.43%   -7.28%     
==========================================
  Files          27       28       +1     
  Lines         816      908      +92     
==========================================
- Hits          577      576       -1     
- Misses        239      332      +93     

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