Extend generator script by precision and blending

Michael Zikelirequested to merge
zikelim/TypesAndBlending into main

Add an option for precision and blending to the generate.py script.

Note, with this MR, real_t is no longer supported since it is not uniquely defined, it could be float64 or float32. The default is set to walberla::float64.

Edited by Michael Zikeli

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