Implementing component manager

[germa89]

Same as parameters.

It should facilitate its usage. However, because we are working python, it probably better to use python lists to store ids.

my_nodes= [1, 2, 3]
mapdl.nsel("S","",my_nodes)

instead of:

mapdl.components["my_nodes"] = "nodes", [1,2,3]

But if we are working with workbench files (ds.dat) files I think this will be appreciated.

Close #1404

[germa89]

Feedback is appreciated @koubaa @akaszynski

However I promised to work on something else this week (which I didn't know it had less days) so I might post-pone this for later. I did this during my last flight so...

[germa89]

@clatapie ... again mapdl.download giving issues...

[Gryfenfer97]

If you want to have "" as an option you should add "" in the Literal: Literal["VOLU", ..., "NODE", ""] or add another literal with "" in the union:
Union[Literal["VOLU", ..., "NODE"], Literal[""]]
This is probably why black cannot parse the file