Props union and intersection rules

[JakeSidSmith]

Note: readme updates will not be made until we're ready for a release. At this point I will document installation, configuration, and all rules.

Add rules to disallow prop unions and intersections within Component definitions e.g.

extends Component<Props & RouteProps>
extends PureComponent<{} | Props>

Reasoning: this better ensures that the external interface for a component matches the internal interface, or is modified by HOCs correctly.

Rules config:

{
  "rules": {
    "no-component-prop-intersection": true,
    "no-component-prop-union": true
  }
}

[pmg103]

Looks good to me! Can you put in the PR description the 'why' though as its not immediately obvious (to me at least) the rationale for these new rules

[AngryLawyer]

This looks great :)