Merge Navier-Stokes-Brinkman implementation from Fortran to C++

[JonathanPham]

Problem

The Navier-Stokes-Brinkman equations were originally implemented by @fgerosa in the Fortran version of svFSI for modeling porous media in her paper. We want to merge this implementation into svFSIplus.

Solution

The Navier-Stokes equations implemented in fluid.[h/cpp] should be updated to be Navier-Stokes-Brinkman equations, where the Brinkman component can be turned off or on, depending on the desired physics. If this component is turned off, then we should recover exactly the original Navier-Stokes implementation. If it is turned on, then the simulations should exhibit permeability effects (from the Brinkman term).

There is a permeability parameter used in the Brinkman component. We can set this parameter to have a default value of 0, so that the default physics is Navier-Stokes.

Additional context

No response

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