Eliminate pyright errors

[pushfoo]

TL;DR: Non-#type: ignore fixes for GUI type issues through annotations + int conversion

Why

1. Build failure details on every commit are:
   • wasting everyone's time since we always have to inspect the build failures to see what they mean
   • confusing and scaring less experienced contributors
2. Until pyglet 2.1 finishes the float conversion of their labels & layouts, we need to account for it:
   • pyglet 2.0.X (our current version) will probably keep the int behavior / storage for layouts
   • pyglet 2.1 + dev releases (our future version) will switch to float storage
     • text layout & other positioning may floor / round values to whole pixels
     • animatable / data storage would remain float to avoid error loss / jitter
   • pyglet hasn't implemented the new behavior yet
3. LRWH rectangles have uses outside of the GUI (Complete Camera Overhaul #1853)

Changes

1. Add AsFloat = Union[float, int type to:
   • Make pyright happy
   • Convey meaning to readers
2. Annotate + document arcade.gui.Rect
3. Add tests for existing arcade.gui.Rect.scale behavior
4. Add rounding=None behavior to arcade.gui.Rect.scale + tests
5. Add int conversion shims to stop pyright issues
   • We haven't yet switched to a pyglet 2.1dev*release
   • The float storage behavior hasn't beein implemented on their side yet
   • would fix issues with their .pyi useful to reduce #type: ignore cruft

Test steps taken

• Add tests for any new functionality
• CI
• Human shakedown of the GUI after changes
  • Linux (pushfoo)
  • Mac (@eruvanos)
  • Windows (DigiDuncan)

[eruvanos]

Thanks for the contribution.

@pushfoo Is this ready to merge? For me it looks fine, the new functionality within Rect seems to be useful and the AsFloat makes the usage of values clear.

[pushfoo]

TL;DR: Give it a look over on Mac and Windows for the text scrolling text and text drawing examples?

I just went through those examples under Linux. It looks fine here as far as a quick glance can tell. @DigiDuncan @DragonMoffon could you two help out look at those examples under Windows? Also, I think Eruvanos has a mac.

Btw, scale changes are actually somewhat conservative. I'm considering more in the future but the current one seemed small enough to merge now.