Consider using pyproject.toml

[Alex Kaszynski]

As noted by @greschd, we can incorporate the use of pyproject.toml and "pin" certain pyansys packages that we know have been tested and are compatible to allow the user to install the the latest pyansys packages for a certain release. Potentially in the following manner (up for discussion):

pip install pyansys==2022R1

We could also install individual packages with:

pip install pyansys[mapdl]

or

pip install pyansys[pymapdl]

[Roberto Pastor Muela]

This one will be solved on #34