Basics for the multi_window_camera_ui example

[tjlaxs]

Objective

• Simple multi window example for testing
• Fixes Multi-window + camera UI example #17451

Solution

• Combining stuff from multiple examples to create a new example/test
• Trying to add multiple kind of UI stuff for test
  • multiple windows
  • box shadows
  • multiple fonts

Testing

• Did you test these changes? By running the example

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Showcase

• TODO: Will insert a screenshot later here