Java import of inner enum not inferred

[stuhood]

An import of an inner-enum from/to Java within the same package is not inferred.

import akka.http.shaded.com.twitter.hpack.HpackUtil.IndexType;

final class HpackUtil {
  ...
  enum IndexType {
    ...
  }
}

The import is extracted, but the declared type is not exposed.

[stuhood]

This represented roughly 2.5% of the issues in akka-http.

[chrisjrn]

I suspect this has something to do with static type handling, but unsure.

[stuhood]

Closing in favor of #13765.