[1/N] Fix type annnotations on UnetApplyConds

[huchenlei]

This PR comes from doctorpangloss's comment:

it is great that you are doing this 7718ada
please take a look at https://github.com/hiddenswitch/ComfyUI/blob/master/comfy/model_management_types.py
generally for python you should not declare a single typings file because something like what you wrote is transitively importing torch which is usually undesired for type annotations

for TypedDict you meant to use NotRequired[...], which means you must import from typing_extensions for python 3.10 compatibility. while it's unlikely you will ever want to use that particular typings file without having imported torch earlier, you will in other cases

This PR:

• Rename types.py to model_patcher_types.py
• Use NotRequired to replace Optional to represent optional dict entry
• Add from __future__ import annotations