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 36.66667% with 228 lines in your changes missing coverage. Please review.

Project coverage is 58.94%. Comparing base (a922f71) to head (0ceef9a).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Rheologies/brittle_bingham_maxwell_rheology.jl	0.00%	121 Missing ⚠️
src/SeaIceDynamics/stress_balance_free_drift.jl	3.33%	58 Missing ⚠️
src/tracer_tendency_kernel_functions.jl	23.52%	13 Missing ⚠️
src/sea_ice_advection.jl	50.00%	11 Missing ⚠️
src/Rheologies/elasto_visco_plastic_rheology.jl	85.18%	8 Missing ⚠️
src/SeaIceDynamics/sea_ice_external_stress.jl	0.00%	6 Missing ⚠️
src/Rheologies/Rheologies.jl	50.00%	4 Missing ⚠️
src/Rheologies/viscous_rheology.jl	60.00%	4 Missing ⚠️
src/sea_ice_time_stepping.jl	62.50%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #71       +/-   ##
===========================================
- Coverage   70.44%   58.94%   -11.50%     
===========================================
  Files          27       29        +2     
  Lines         829      989      +160     
===========================================
- Hits          584      583        -1     
- Misses        245      406      +161     

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