require-returns-check: Skip interface class methods

[l1bbcsg]

As per jsdoc @interface tag description, class marked with this tag should denote that all members of the class are interface symbols and therefore functions can have @returns tag, but no function body with return statement.

This pull request makes the following code valid:

/**
 * @interface
 */
class Foo {
    /**
     * @returns {string}
     */
    bar () {}
}

While previously require-returns-check reported bar as missing return value;

[gajus]

🎉 This PR is included in version 8.4.4 🎉

The release is available on:

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

Your semantic-release bot 📦🚀