View transition: implement types for cross-document view transitions

- Parse @view-transition { types: ... }
- Reflect in CSSViewTransitionRule.types
- Apply types to the view transition style in old+new document
- Expose types on ViewTransition objects in
  PageRevealEvent/PageSwapEvent

Bug: 331619870
Change-Id: I4d4e7980e256825b2735e5e4264b67a28224a845
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5402138


Commit-Queue: Noam Rosenthal <nrosenthal@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1280204}