no-undefined-types: Treat GCC generic types as defined

[l1bbcsg]

This pull request adds support for Google Closure Compiler Generic (aka Template) types to no-undefined-types.

Makes the following code valid:

/**
 * @template TEMPLATE_TYPE
 */
class Foo {
    /**
     * @return {TEMPLATE_TYPE}
     */
    bar () {
    }
}

While previously no-undefined-types reported TEMPLATE_TYPE in bar as undefined.

[brettz9]

I made a simplification (using flatMap). If you can also just add the invalid example as mentioned, I think this will be ready.

[gajus]

🎉 This PR is included in version 8.4.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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