Code Insight: "Generate toString" action

#KT-10309 Fixed

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

@@ -0,0 +1,14 @@
+import java.util.Arrays
+
+// 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=${Arrays.toString(n)}, s=${Arrays.toString(s)}, f=$f)"
+    }
+}