isSamePackageAs method
Whether this URI and other are each 'package:' URIs referencing the same
package name.
Implementation
bool isSamePackageAs(Uri other) {
  return isScheme('package') &&
      other.isScheme('package') &&
      pathSegments.isNotEmpty &&
      other.pathSegments.isNotEmpty &&
      pathSegments.first == other.pathSegments.first;
}