New J2K: separate nullability inference from common one & nullability bug fixes

It will be needed for structure mutability inference

#KT-21467 fixed
#KT-32609 fixed
#KT-32572 fixed
#KT-24677 fixed

nj2k/testData/inference/nullability/useAsReceiver.kt

@@ -0,0 +1,9 @@
+fun test() {
+    val x: /*T2@*/List</*T1@*/Any> = listOf</*T0@*/Any>()/*List<T0@Any>!!L*/
+    x/*T2@List<T1@Any>*/.get(0/*LIT*/)
+}
+
+//T0 <: T1 due to 'INITIALIZER'
+//LOWER <: T2 due to 'INITIALIZER'
+//T1 <: T1 due to 'RECEIVER_PARAMETER'
+//T2 := LOWER due to 'USE_AS_RECEIVER'