STC: add error for write of private or package-private field of super class

GROOVY-8999, GROOVY-9093, GROOVY-9136, GROOVY-9195, GROOVY-9288, GROOVY-9292, GROOVY-9293, GROOVY-9695 and others cover various scenarios where read access to a field should or should not be allowed. One scenario that is yet uncovered is writing to a private or package-private field from a super class.

Consider the following:

package p
class C {
  private /*or @PackageScope*/ Object field
}

package q
class D extends C {
  @groovy.transform.CompileStatic
  void test() {
    field = null // should be error
  }
}

Also need static, closure and inner class variants.

I also think that @TypeChecked is not producing errors for any field access cases. Not sure if it is desirable to limit the checks to the SC path.