Migrate hovered outline to synchronized stores

[TrySound]

Recently added support for synchronization of non-immerhin stores. Here refactored instance hovering from pubsub to such stores.

Designer and canvas can both set hovered instance id and instance connector subscribes to these changes and sends to designer outline rect.

Code Review

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

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: 5de6)
• updated test cases document
• added tests
• if any new env variables are added, added them to .env.example and the designer/env-check.js if mandatory

[vercel]

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Name	Status	Preview	Comments	Updated
oss-webstudio-designer	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Jan 25, 2023 at 7:41AM (UTC)
webstudio-designer	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Jan 25, 2023 at 7:41AM (UTC)