Rule proposal: no-nested-components

[michalsnik]

Style guide:
https://vuejs.org/v2/style-guide/#Tightly-coupled-component-names-strongly-recommended

Description:
This rule would warn about nested components, as it is recommended to keep components directory flat, for reasons explained in the style guide.

[chrisvfritz]

Hm, I'm not sure this rule would actually have value. We do mention in the detailed explanation that for larger applications, some limited nesting is probably OK, so it's not a "hard" rule. Also, it would be difficult to accidentally nest components and also difficult to miss nesting in a code review, so I'm guessing it would possibly take up more time to configure than it would save.

[michalsnik]

You're right @chrisvfritz