RCS1202 Avoid NullRef - Needs to be more strict

[zitcomdev]

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Steps to Reproduce:

interface Foo {
  bool? Get();
}

class Bar {
  void DoStuff(Foo foo) {
    var x = foo.Get().Value;
  }
}

Actual Behavior: RCS1202 Avoid NullRef not triggered

Expected Behavior: RCS1202 Avoid NullRef should be triggered

Other: Think RCS1202 should be a warning by default.