Vue 3 support

[quank123wip]

As Vue 3 is coming out, more and more frameworks, projects only support Vue 3, it's time to bring up a Vue 3 support.

[thearabbit]

+1

[SvenWangChina]

+1

[diavrank]

+1

[ma-jo-ne]

+1

[hluz]

+100

[pdshah3690]

+1

[cristian-ciobanu]

+1

[WayneUong]

+1

[fracz]

It would be really nice to have a clear statement regarding the migration to Vue 3 or at least fixing support for Vue 2 #437

Should we start to escape from Vue & Meteor apps?

@Akryum