refactor: remove vue [do not merge]

[hwiem]

Allow using this library in vue 3 projects:

• Make vue a peer dependency (>= 3) (it remains a dev dependency too, as it is used in the tests)
• Make vuex a peer + dev dependency (>= 4, internal usages are removed, except for in tests)
• Remove vue-template-compiler (only needed for vue 2)
• Update jest and related dependencies to work with vue 3

Tasks

• [x] make the library work with vue 3 compat mode
• [x] fix tests (add vuex to dev dependencies, etc)

[mussbach]

I would agree with you and prefer a 0.1.x as well

[salisdemos]

Sounds good for me. Totally agree.