Improve animation for the Maui Bottom sheet control

[naveenkumar-sanjeevirayan]

Root Cause of the Issue

1. Scroll occurs both in the bottom sheet and its child in iOS.
2. Updated padding to the entire bottom sheet.
3. The overlay grid disappears suddenly when IsModal is set to false or transitioned to a hidden or collapsed state.
4. The bottom sheet gets stuck when swiped and released at some points.

Description of change

1. When scroll view is placed as a child in bottom sheet content, restricted scroll based on touch points.
2. Default padding(5) is provided to the entire bottom sheet.
3. Provided animation to overlay in the bottom sheet.
4. Improved nearest point of bottom sheet state when swiped.

Issue Fixed

#96

#97