Limit no-customized-built-in-elements to built ins

[mbullington]

Description

This PR changes no-customized-built-in-elements to only error if the extended class is a value of builtInTagMap (except HTMLElement, of course).

          node.superClass &&
          node.superClass.name !== 'HTMLElement' &&
          Object.values(builtInTagMap).includes(node.superClass.name)

The main motivation behind this work is extending a class that itself extends HTMLElement, without the complexity of static analyzing.

Alternatives

Alternatively to this PR, users could just turn this rule off, but would lose slight benefit.

We could also have an allowlist for this rule, allowedSuperNames, similar to #38

Breaking changes

This may change the actual (not expected) behavior of no-customized-built-in-elements in slight ways

[keithamus]

LGTM! @koddsson thoughts?

[koddsson]

Yup! Looks great to me 👍🏻