Sagi Buchbinder-Shadur

Ok. Closing this PR in favor of a more thorough change.

do some merge

Hey @davidism . I would love to hear your feedback on this PR.

Does this PR need any changes? Is it `click` 8.2.0 material? 9.0.0? I would love to know so I could work on it if any changes are necessary. I think...

Hey @sscherfke , once David will approve that he intend on merging this PR (in the near or far future) I will add the relevant documentation and add any test...

This PR still waits for @davidism approval. I know there are issues about testing and API in this PR, but I can't work on it until David do an initial...

Really looking forward to this issue closure. I think it is a much-needed ability that can really elevate my code.

This functionality is much needed. Is there someone working on it?

Specifically, I need 2 functionalities for my project: 1. `get_dimensions()`: get all the dimensions available in the registry (containing compound dimensions such as `speed` which is `length / time`. e.g....

Also, this PR doesn't pass pre-commit at the moment. You might want to run `pre-commit run -a` in order to make sure that all files are according to *Click*'s style...