Add syntax highlighting for match-case clauses (PEP 622, 634, 635, 636)

[idanw206]

I tried the new feature in Python 3.10.0b3 using IPython, (verison 7.25.0) and the new syntax wasn't highlighted.
I think that it will be great to support it also for the RC versions.

Thanks!

references:
https://www.python.org/dev/peps/pep-0634
https://www.python.org/dev/peps/pep-0635
https://www.python.org/dev/peps/pep-0636

[MrMino]

Yup, this is yet to happen. Relevant module (AFAIK) for people who want to help: IPython.utils.PyColorzie, which is also used by %pycat.