Create From Usage: Quote declaration name if it's not a valid identifier

#EA-70291 Fixed

idea/testData/quickfix/createFromUsage/createFunction/binaryOperations/quotedName.kt

@@ -0,0 +1,4 @@
+// "Create extension function '\u00A0'" "true"
+fun test() {
+    val t: Int = 1 <caret>`\u00A0` 2
+}

idea/testData/quickfix/createFromUsage/createFunction/binaryOperations/quotedName.kt.after

@@ -0,0 +1,8 @@
+// "Create extension function '\u00A0'" "true"
+fun test() {
+    val t: Int = 1 `\u00A0` 2
+}
+
+fun Int.`\u00A0`(i: Int): Int {
+    throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.
+}