FIR: Explicitlty separate static and member scopes

For Java, they have rather different semantics considering "overrides"
and obtaining functions/properties from supertypes

See the Java statics implementation

compiler/testData/diagnostics/tests/j+k/inheritanceStaticMethodFromInterface.fir.kt

@@ -22,7 +22,7 @@ fun main() {
 
     C.a
     C.b
-    C.foo()
+    C.<!UNRESOLVED_REFERENCE!>foo<!>()
     C.bar()
 
     K.<!UNRESOLVED_REFERENCE!>a<!>