Adding support to ***inq functions (#799)

* Adding inq functions commands.

* Added MAPDL inquire functions

* Added references to documentation

* Improving format.

* Adding gRPC wrappers.

* Fixing style.

* Deleted extra self.

* Added unit test.

* Removing color which was giving sphinx formatting error.

* Style fixing.

* Spelling typos.

* Fxing test for non-grpc modes.

* Fixing gramamr and format.

* Fixing `mpinqr` func.

* Updated doc string of sectinqr with the command comments.

* Using `scalar_param` instead of using our own request.

* Removing extra self.

* Applying code review.

* Removing parameter deletion.

* Applying code review.

* Implementing code review suggestions.

* Improving docs

* Adding `wrinqr` function

* Update inq_func.py

Removing space.

* Update inq_func.py

Grammar fixing.

* Getting back the args verbosity, to avoid breaking the test.

* Improved doc string.

* Better docstrings

* Better docstrings