@angular-eslint/component-selector - unique component selectors

[nivekcode]

Package @angular-eslint/component-selector.

Type Feature request

Description In our repository, we use typedoc to generate and display sample code in a showcase for our UI component library. Sometimes people add two examples that accidentally have the same component selector. In such cases, the Typedoc are wrong and only display the second example. I was wondering if this rule could be extended so that it also ensures that a component selector is unique.