FIR checker: report uninitialized member/extension properties

compiler/fir/analysis-tests/testData/resolve/diagnostics/annotationClassMember.kt

@@ -2,6 +2,6 @@ annotation class A() {
     <!ANNOTATION_CLASS_MEMBER!><!PRIMARY_CONSTRUCTOR_DELEGATION_CALL_EXPECTED!>constructor(s: Nothing?)<!> {}<!>
     <!ANNOTATION_CLASS_MEMBER!>init {}<!>
     <!ANNOTATION_CLASS_MEMBER!>fun foo() {}<!>
-    <!ANNOTATION_CLASS_MEMBER!>val bar: Nothing?<!>
+    <!ANNOTATION_CLASS_MEMBER, MUST_BE_INITIALIZED_OR_BE_ABSTRACT!>val bar: Nothing?<!>
     <!ANNOTATION_CLASS_MEMBER!>val baz get() = Unit<!>
 }