[feature][Python] Add FieldVector 0 to 12 to Python lib to avoid compilation times.
This replaces !1353 (closed). There also exists a MR in dune-geometry!244 (merged).
This also replaces !942 (closed) which was a different approach which use separate module files. This was not wanted, so with this approach we only have a _common.so
compiled module.
By default this option is disabled. So the status quo is not changed.
Edited by Robert K