feat(types): adds support for TypeGuard and TypeIs

[InvincibleRMC]

Description

Allows annotating functions for type narrowing using TypeGuard or TypeIs.

For additional information relating to the specific differences between TypeGuard and TypeIs can be found here.

def is_str_type_guard(x: object) -> TypeGuard[str]:
    return isinstance(x, str)

def is_str_type_is(x: object) -> TypeIs[str]:
    return isinstance(x, str)

Suggested changelog entry:

   Adds support for `typing.TypeGuard` and `typing.TypeIs`.