⭐️New: Add rule no-duplicate-attr-inheritance

[privatenumber]

This rule makes sure you're setting inheritAttrs to false when it detects v-bind="$attrs".

This rule is to prevent duplicated attribute inheritance: http://jsfiddle.net/hirokiosame/h0j3qrbm/

Can update the docs if there's consensus on the rule proposal.

[armano2]

ticket: #626

[armano2]

What we should do with mixins and extend? property can be set inside them.

[privatenumber]

@armano2
What do you think of the following behavior?

• If it detects a mixin being pulled in, the rule gives the user the benefit of the doubt that inheritAttrs: false is set via the mixin. We can either emit a warning instead of an error, or emit no error at all.
• If the component is extended upon, then the base should be responsible for having inheritAttrs: false IMO. It shouldn't be the extending component's responsibility to patch a bug in the base component.

[michalsnik]

Thanks for working on it @hirokiosame , however I'm going to close this PR for the moment, until we decide whether it's something we want to consider. Let's continue discussion in the relevant issue: #626