fix(parser): support parsing expressions in extend clause

[dimitryvolkov]

Currently esdoc fails for code containing a call expression in 'extends' clauses which is a supported feature and is popular with mixins.

Failing code:

function mix() {
	return {
		with: function () {
			return class { };
		}
	};
}
class Test extends mix().with() { }

[h13i32maru]

Thanks

[oravecz]

What should this PR allow? I didn't see any change in my web component docs which are using mixins using a different approach.

Should this PR allow the identifications of mixins when implemented such as these techniques?

class Test extends Mixin1( Mixin2( HTMLElement ) )

or a Composable implementation

class Test extends Composable(HTMLElement).compose( Mixin1, Mixin2 )