Extract Function: Add 'suspend' modifier if extracted function contains suspend-calls

#KT-14704 Fixed

idea/testData/refactoring/extractFunction/basic/suspendCall.kt

@@ -0,0 +1,10 @@
+fun async(f: suspend () -> Unit) {}
+
+suspend fun await() {}
+
+// SIBLING:
+fun main(args: Array<String>) {
+    async {
+        <selection>await()</selection>
+    }
+}