Add 2D Potential Temperature Formulation for the Euler Eqs.

[MarcoArtiano]

This PR adds the Potential Temperature formulation for the Euler Eqs., where the energy equation has been substituted with the evolution of the potential temperature. The equations have been tested on the warm bubble dry test. The fluxes LMARS and an entropy conservative flux (total energy conserving) have been also added.

[codecov]

Codecov Report

Attention: Patch coverage is 63.05419% with 75 lines in your changes missing coverage. Please review.

Project coverage is 77.87%. Comparing base (223fefe) to head (6c91b29).

Files with missing lines	Patch %	Lines
...ons/compressible_euler_potential_temperature_2d.jl	60.00%	72 Missing ⚠️
src/equations/compressible_moist_euler_2d_lucas.jl	86.95%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
- Coverage   81.78%   77.87%   -3.91%     
==========================================
  Files           8        9       +1     
  Lines         829     1008     +179     
==========================================
+ Hits          678      785     +107     
- Misses        151      223      +72     

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[ranocha]

Thanks! Could you please add the new elixir to the tests so that the new code runs as well in CI?

[MarcoArtiano]

Thanks! Could you please add the new elixir to the tests so that the new code runs as well in CI?

Thanks! Could you please add the new elixir to the tests so that the new code runs as well in CI?

Yep, thanks for the reminder! The test has been added now.