Keep widget theme metadata synchronized when width or height are changed via configure

[ajkessel]

I've started running this code through updated unit tests based on my https://github.com/ajkessel/Custom2kinter/tree/m1-test-foundation branch. I will eventually propose those branch as a PR, but first I wanted to get some fixes through that the unit tests have surfaced.

This PR keeps widget theme metadata synchronized when width or height are changed via configure(). This fixes cget("width") / cget("height") returning stale constructor or theme defaults for widgets like CTkButton, CTkLabel, CTkFrame, and CTkEntry after resizing.

[FedericoSpada]

Unfortunately, it doesn't work for widgets that inherit from another widget rather than directly from CTkWidget, such as CTkSegmentedButton, CTkToggleButton, and CTkFloatingFrame, since they have dedicated _theme_info attributes, all with slightly different names.

The perfect solution would be to modify all cget() methods from:

elif attribute_name in self._theme_info:
    return self._theme_info[attribute_name]

to

elif attribute_name in self._theme_info and attribute_name not in CTkWidgetArgs.__annotations__:
    return self._theme_info[attribute_name]

I'll do it in the next commit.

[ajkessel]

That makes sense. I think your fix will also cover the next failure I encountered with the pytest conversion work: CTkEntry.configure(bg_color="green") updates CTkWidget._bg_color, but CTkEntry.cget("bg_color") currently returns stale _theme_info["bg_color"] ("transparent") before it can delegate to CTkWidget.cget().

Since CTkWidgetArgs.__annotations__ includes width, height, and bg_color, excluding those keys from subclass _theme_info handling should fix both the dimension round-trip failures and the bg_color round-trip failure.