Implement Dimension

[emanuellima1]

Question:

• The type of dtype is just a type? I think it should be a union, or else it will cause problems.

I still have to write more tests, but will open the discussion now.

[tylerdmace]

I don't see any reason why it would need to be a union. Type should suffice. Also, are the params ordered when declared as a @dataclass? If, so, I'd like to see dtype first followed by name and description.

[tylerdmace]

One last change that I see which is that I believe we want __eq__ to also check description. @mzargham Is this take correct?

[emanuellima1]

It is checking, on line 93.