KotlinGenerateToStringAction: should generate .contentToString instead java.util.Arrays.toString

#KT-27563 Fixed

idea/testData/codeInsight/generate/toString/multipeTemplates/arrays.kt.after

@@ -1,5 +1,3 @@
-import java.util.Arrays
-
 // GENERATOR: MULTIPLE_TEMPLATES
 class A(val n: IntArray, val s: Array<String>) {
     val f: Float = 1.0f
@@ -10,8 +8,8 @@ class A(val n: IntArray, val s: Array<String>) {
 
     override fun toString(): String {
         return "A(" +
-                "n=${Arrays.toString(n)}, " +
-                "s=${Arrays.toString(s)}, " +
+                "n=${n.contentToString()}, " +
+                "s=${s.contentToString()}, " +
                 "f=$f" +
                 ")"
     }

idea/testData/codeInsight/generate/toString/singleTemplate/arrays.kt.after

@@ -1,5 +1,3 @@
-import java.util.Arrays
-
 // GENERATOR: SINGLE_TEMPLATE
 class A(val n: IntArray, val s: Array<String>) {
     val f: Float = 1.0f
@@ -9,6 +7,6 @@ class A(val n: IntArray, val s: Array<String>) {
     }
 
     override fun toString(): String {
-        return "A(n=${Arrays.toString(n)}, s=${Arrays.toString(s)}, f=$f)"
+        return "A(n=${n.contentToString()}, s=${s.contentToString()}, f=$f)"
     }
 }

idea/testData/codeInsight/generate/toString/singleTemplate/nullableArrays.kt

@@ -0,0 +1,8 @@
+// GENERATOR: SINGLE_TEMPLATE
+class A(val n: IntArray?, val s: Array<String>) {<caret>
+    val f: Float = 1.0f
+
+    fun foo() {
+
+    }
+}

idea/testData/codeInsight/generate/toString/singleTemplate/nullableArrays.kt.after

@@ -0,0 +1,12 @@
+// GENERATOR: SINGLE_TEMPLATE
+class A(val n: IntArray?, val s: Array<String>) {
+    val f: Float = 1.0f
+
+    fun foo() {
+
+    }
+
+    override fun toString(): String {
+        return "A(n=${n?.contentToString()}, s=${s.contentToString()}, f=$f)"
+    }
+}