[Flexiglass] Add overscroll DSL

This CL adds definitions of the overscroll behavior for certain scenes.
Additionally, the swipe specification is adjusted to create a soft
spring effect at the end of a transition.

Note: The overscroll definitions are arranged alphabetically.

Test: Manual tests
Bug: 327257459
Flag: NA
Change-Id: I873f62104f429e74e1185900490d50d87b00b022