Feature request: custom animation duration

[Gargo]

For example the default animation duration is usually 0.3 but your library uses 0.9. It causes problems when I want to animate something else simultaneously with pull up view (like adding blur behind it).

It could be fixed by overriding some methods but you marked almost everything as internal (inaccessible outside pod sources)

[Ahmadalsofi]

@Gargo Appreciated if you could contribute by making a PR with the fixes.