support for 3.12 type aliases

[HEROgold]

Summary

Discord 2.3.2 doesn't support python 3.12 type alises

What is the feature request for?

discord.ext.commands

The Problem

When creating aliases like this
MemberOrRole = Role | Member
The transformer has no issues

When creating aliases with the type statement, the transformer raises the error unsupported type annotation.
type MemberOrRole = Role | Member

The only difference in this example is the statement.

The Ideal Solution

Being able to just use type MemberOrRole = Role | Member
or more complex situations like type NumberOrStringSequence [T: (int, float, str)] = Sequence[T]

The Current Solution

No response

Additional Context

The type statement for type aliases allows for generic type annotation, without the need for the typing module, and this greatly improves the coding experience for those that use 3.12. Just like mentioned on the PEP-695 it allows for declaring types, with constraints. That leads to a more controlled and readable environment.

[No767]

I really doubt that this is needed. I'll let the rest decide on this

[Rapptz]

Should be doable. It's a typing.TypeAliasType so not too bad to add to support to it.