New J2K: Split old j2k and new j2k tests

nj2k/testData/newJ2k/methodCallExpression/collectionsMethods.kt

@@ -0,0 +1,9 @@
+internal class A {
+    fun foo(): Map<String?, String?> {
+        val list1: List<String?> = emptyList()
+        val list2: List<Int?> = listOf(1)
+        val set1: Set<String?> = emptySet()
+        val set2: Set<String?> = setOf("a")
+        return emptyMap()
+    }
+}