Privately imported trait methods are not reported

[weirdan]

Methods could also be imported as private: https://3v4l.org/R9gM8
Currently Psalm fails to detect public calls to such privatised methods: https://getpsalm.org/r/3e50cee4ef

Originally posted by @weirdan in 4d95962#commitcomment-31861520

<?php
  trait T {
    public function f(): void {}
  }
  class C {
    use T { f as private; }
  }

  (new C)->f();

Expected issue: call to a private method from outside of the class
Actual: No issues.

[muglug]

*sigh* thanks. I don't really understand the point of this feature.

[muglug]

Oh this is actually a dupe of #909