Add eslint-vue-plugin to our stack

Instead of checking manually if our vue code matches our vue style guide we should add eslint-vue-plugin instead. https://github.com/vuejs/eslint-plugin-vue

Some rules we try to follow are already there. Checking for them manually is error prone and time consuming.

@iamphill @fatihacet @jschatz1 what do you think? Can I open a MR with this change?