Upgrade to vue 3 component

[tolgap]

Vue 3 has a number of changes:

• No more functional components. Instead, just create a function that returns the VNodes.
• Render functions don't receive h anymore. h is now an export of vue which forces library authors to figure out how to depend on vue exports, without bundling the entirety of Vue into your library
• Exposed an issue of unnecessary rendering when using custom nodeRenderers, which prompted the usage of readonly richtext document

Fixes #18

[hturnbull93]

Hi there @tolgap ! I hope you are well.

Now that Vue3 is released, shall this be merged and released?

It appears to work fine with my Vue3/Nuxt3 project, though it does suffer from faulty ESM export as described in this issue (though this is minor, I can import the cjs)

[tolgap]

@hturnbull93 thanks for reminding me! Released as 3.0.0 🎉 .

[hturnbull93]

@tolgap Thank you :)