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/common/functionCall.kt

@@ -0,0 +1,10 @@
+fun test() {
+    val x: /*T1@*/List</*T0@*/Int> = nya()/*T3@List<T2@Int>*/
+}
+
+fun nya(): /*T3@*/List</*T2@*/Int> {
+    TODO()
+}
+
+//T2 <: T0 due to 'INITIALIZER'
+//T3 <: T1 due to 'INITIALIZER'