Custom inlets via python wrapper

[pcarruscag]

Proposed Changes

SetMarkerCustomInletFlowVar0(marker, vertext, val)
SetMarkerCustomInletFlowVar1(marker, vertext, val)
SetMarkerCustomInletFlowDirection(marker, vertext, xyz)

Related Work

#1079

PR Checklist

• I am submitting my contribution to the develop branch.
• My contribution generates no new compiler warnings (try with --warnlevel=3 when using meson).
• My contribution is commented and consistent with SU2 style (https://su2code.github.io/docs_v7/Style-Guide/).
• I used the pre-commit hook to prevent dirty commits and used pre-commit run --all to format old commits.
• I have added a test case that demonstrates my contribution, if necessary.
• I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp), if necessary.

[bigfooted]

Thanks Pedro! For incompressible, we can use this but with different meaning at Var0, Var1, right?

For each of the other solvers like turbulence, species, a CustomTurbVar(marker,vertex,val,index) and a CustomSpeciesVar(marker,vertex,val,index) can then be introduced in the same way?

[pcarruscag]

Yep, even for compressible flow there is a different meaning for mass flow inlet, vars 0 and 1 are density and velocity magnitude instead of total pressure and temperature, that's why I went with Var0 and Var1 for names.

Yeah good idea, I'll rename these functions to have "Flow" in the name.