Floating Panel - Add Keyboard Avoidance Support

[dfeinzimer]

Apollo # 102

Before	After
before.mp4	after.mp4

Adds keyboard avoidance functionality to the Floating Panel component and updates its associated example view. The example view has been reworked to set the stage for presenting different types of content compared to the single static list it currently presents. This should help to demonstrate and more easily test different use cases for the Floating Panel.

[mhdostal]

The displaying/hiding the keyboard, the height of the floating panel changes a bit; is this expected?

[mhdostal]

With the keyboard visible, it is possible to drag the height of the FP beyond the top of the screen:

[mhdostal]

I'm getting incorrect, but different than before, behavior, along with the following message in the console:

2023-08-03 10:34:59.391896-0500 Examples[15616:1674059] [SwiftUI] Invalid frame dimension (negative or non-finite).

Steps:
Present "Text Field"
Click in text entry box
Show keyboard if it doesn't automatically show (this is in the simulator)
The text field scrolls up to avoid the keyboard, but then the floating panel appears to switch to half-height.

At this point, you can no longer drag the FP handle to resize.

[mhdostal]

See the comment on keyboard avoidance and the FP switching to half-height

[dfeinzimer]

This has been re-worked and is ready for review once again.