Add support for PEP634: match and case/structural pattern matching

[ashb]

I'm trying out ruff on a greenfield project (loving it so far! Thank you for it!) where I get to use all the latest python goodies, and I've discovered that it doesn't seem like ruff (v0.0.169) likes match/case:

Simple example:

ruff - <<EOF
name = "abc"
match name:
    case "def":
        print("def")
    case _:
        print("default")

EOF
Found 1 error(s).
-:2:8: E999 SyntaxError: invalid syntax. Got unexpected token 'name'

(Replace ruff with python and it'll run fine, of course.)

This syntax was added via https://peps.python.org/pep-0634/ in Python 3.10

I'll won't be able to get around to attempting a PR for this before the New Year, if someone beats me to it I owe you a drink of your choice!

[g-as]

Duplicate #680

[ashb]

Close as duplicate of #282 - sorry I clearly massively failed in searching (I think I was looking for case match and not "pattern matching". I wasn't aware that is what it was called in python until I went to find the PEP for it)

[g-as]

No worries