fix: Implement TraverseStatement.refersToParent() exception

[TalkingSiren]

What does this PR do?

Fix the UnsupportedOperationException (Implement TraverseStatement.refersToParent()) when using sql traverse

Motivation

Needed because of migration from orientdb and there it worked.

Checklist

• I tried to build but tests failed everywhere

[lvca]

Checked in the OrientDB source code and its implementation is:

  public boolean refersToParent() {
    if (projections != null && projections.stream().anyMatch(x -> x.refersToParent())) {
      return true;
    }
    if (this.target != null && this.target.refersToParent()) {
      return true;
    }
    if (this.whileClause != null && this.whileClause.refersToParent()) {
      return true;
    }
    return false;
  }

[lvca]

Just pushed the same as for OrientDB. Thanks for reporting it.