Allow for screen scaling adjustment

[mdales]

Currently Claudius does not allow for window resizing, providing just a fixed sized canvas which is suited for doing generative art, retro computing graphics, and games.

However, because often the "retro" style graphics use low resolutions (e.g., 240x144 for TIC-80, 320x200 or 640x480 for VGA emulation), we provide a scaling factor when creating the screen:

   Palette.generate_mono_palette 16 |>
   Screen.create 320 200 4 |>
   Base.run "test" None tick

But what is a good scaling factor will vary from display to display and from user to user, so it might be good to let users change that for themselves

Options here:

• Allow window resizing using the mouse - the challenge here is ensuring that the aspect ratio remains the same
• Allow the user to use a key-combination to increment or decrement the scale factor, like using ctrl-plus and ctrl-minus in a browser. the challenge here is picking a key combination that people won't want to use in the games they're building with Claudius.

[Vanisha1606]

@mdales Can I work on this issue?
Here is my approach to solve this issue :

1. Allow Window Resizing but Maintain Aspect Ratio
   To allow window resizing with the mouse while ensuring the aspect ratio remains correct, override the resize event and snap the window to valid sizes:
   Implementation Steps:
   -Intercept window resize events.
   -Compute the closest valid integer scale factor (e.g., 1x, 2x, 3x, etc.).
   -Resize the window while keeping the aspect ratio locked.
2. Key-Based Scaling (Without Conflicting with Games)
   -To let users adjust the scale dynamically without interfering with game controls:
   -Use Ctrl + Shift + Plus to increase the scale.
   -Use Ctrl + Shift + Minus to decrease it.
   -Use Ctrl + Shift + 0 to reset to default.
   -Show an on-screen message for a few seconds to indicate the scale.