experimental: View Animations support

[istarkov]

Description

ref #2645

• - Add view-timeline-name and scroll-timeline-name support, and prefixer (use custom property for unsupported browsers)
• - Add initial story

Steps for reproduction

https://6382151c8b47d4399fb9fc69-uljkhwtbmc.chromatic.com/iframe.html?args=&globals=&id=sdk-components-animation-view-animations--in-out&viewMode=story

Code Review

• hi @kof, I need you to do
  • conceptual review (architecture, feature-correctness)
  • detailed review (read every line)
  • test it on preview

Before requesting a review

• made a self-review
• added inline comments where things may be not obvious (the "why", not "what")

Before merging

• tested locally and on preview environment (preview dev login: 0000)
• updated test cases document
• added tests
• if any new env variables are added, added them to .env file