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/arrayOfArrays.kt

@@ -0,0 +1,16 @@
+class Test {
+    fun foo() {
+        val x: /*T5@*/Array</*T4@*/Array</*T3@*/Int>> =
+            Array</*T2@*/Array</*T1@*/Int>>(1/*LIT*/, {
+                arrayOf</*T0@*/Int>(2/*LIT*/)/*Array<T0@Int>*/
+            }/*Function0<Int, T6@Array<T7@Int>>*/
+        )/*Array<T2@Array<T1@Int>>*/
+    }
+}
+
+//LOWER <: T0 due to 'PARAMETER'
+//T7 := T0 due to 'RETURN'
+//T1 := T7 due to 'PARAMETER'
+//T6 <: T2 due to 'PARAMETER'
+//T3 := T1 due to 'INITIALIZER'
+//T4 := T2 due to 'INITIALIZER'