feat: add support for nesting vue flows

[simonmysun]

🚀 What's changed?

This draft pull request introduces support for nesting vue-flow components. Different from what's demonstrated in the nesting nodes example, this allows vue-flow instances to be nested.

• Added new routes /nesting-flows and /recursive-nesting-flows in examples/vite/router.ts to demonstrate nested flow components.
• Introduced a new ancestorZoom property in FlowProps to track and manage zoom levels inherited from ancester vue-flow instances.
• Corrected coordinates calculations with ancestorZoom

🐛 Fixes

Bug fixed $\leqq$ 0

🪴 To-Dos

• [ ] find a workaround for nopan class
  • Currently I removed the nopan class from nodes. This should be avoided otherwise it is a breaking change.
• [ ] fix panBy and autopan functionalities
  • Be careful when enabling autopan, it may stuck the browser.
• [x] fix wheel zoom functionality
• [x] add example of recursive nesting flows
• [ ] add tests
• [ ] investigate possible vite routing issues with nested flows
  • recursive-nesting-flows example does not load when switching routes, it only works when reloading the page.
  • nesting-flows example cannot update automatically when file changes.
• [ ] fix fitView functionality
  • Some vue issue or browser issue might be related because I have observed different behaviors in different browsers.
• [ ] performance issues
• [ ] connection offset when starting a connection
• [ ] zoom behavior when max / min zoom reached
• [ ] panning and zooming on minmap
• [ ] possiblely add changeset

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Latest commit: 594617b1763d58dfe78ee1a19529f5e250d11878

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