Enable native View Transition API

[claytongulick]

Allow optional use of View Transition API for navigation transitions.

PR incoming.

[alienself]

Hey @claytongulick do you have an example on how to use view transition with your PR?

[claytongulick]

@alienself Sure, just set enableNativeViewTransitions to true and add some css:

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: .35s;
}