auto-remove things from TYPE_CHECKING blocks

[asottile]

for instance in --py38-plus:

-if TYPE_CHECKING:
-    from typing import Protocol
-else:
-    Protocol = object
+from typing import Protocol

that's the most complex mode -- some of them are simpler (just imports)

[Mahdi-Hosseinali]

This is a bad idea. If you use | between types then it should be None | 'Protocol' which means Protocol is not used. Then the other linters start complaining about unused imports.

[asottile]

what are you even talking about