Introduce ReplaceToStringWithStringTemplateInspection #KT-13782 Fixed

idea/testData/inspectionsLocal/replaceToStringWithStringTemplate/.inspection

@@ -0,0 +1 @@
+org.jetbrains.kotlin.idea.inspections.ReplaceToStringWithStringTemplateInspection

idea/testData/inspectionsLocal/replaceToStringWithStringTemplate/nonReference.kt

@@ -0,0 +1,5 @@
+// WITH_RUNTIME
+// PROBLEM: none
+fun test(): String {
+    return 1.<caret>toString()
+}

idea/testData/inspectionsLocal/replaceToStringWithStringTemplate/simple.kt

@@ -0,0 +1,5 @@
+// WITH_RUNTIME
+fun test(): String {
+    val x = 1
+    return x.<caret>toString()
+}

idea/testData/inspectionsLocal/replaceToStringWithStringTemplate/simple.kt.after

@@ -0,0 +1,5 @@
+// WITH_RUNTIME
+fun test(): String {
+    val x = 1
+    return "$x"
+}

idea/testData/inspectionsLocal/replaceToStringWithStringTemplate/stringTemplate.kt

@@ -0,0 +1,6 @@
+// WITH_RUNTIME
+// PROBLEM: none
+fun test(): String {
+    val x = 1
+    return "Foo: ${x.<caret>toString()}"
+}