Create from usage: Assume String return type for function whch is called inside of string template

#KT-6083 Fixed

idea/testData/quickfix/createFromUsage/createFunction/call/afterCallInStringTemplateRuntime.kt

@@ -0,0 +1,9 @@
+// "Create function 'foo'" "true"
+
+fun test() {
+    println("a = ${foo()}")
+}
+
+fun foo(): String {
+    throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.
+}

idea/testData/quickfix/createFromUsage/createFunction/call/afterQualifiedCallInStringTemplateRuntime.kt

@@ -0,0 +1,11 @@
+// "Create function 'foo'" "true"
+
+class A {
+    fun foo(): String {
+        throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.
+    }
+}
+
+fun test() {
+    println("a = ${A().foo()}")
+}

idea/testData/quickfix/createFromUsage/createFunction/call/beforeCallInStringTemplateRuntime.kt

@@ -0,0 +1,5 @@
+// "Create function 'foo'" "true"
+
+fun test() {
+    println("a = ${<caret>foo()}")
+}

idea/testData/quickfix/createFromUsage/createFunction/call/beforeQualifiedCallInStringTemplateRuntime.kt

@@ -0,0 +1,7 @@
+// "Create function 'foo'" "true"
+
+class A
+
+fun test() {
+    println("a = ${A().<caret>foo()}")
+}