ExtractStreamMapAction: made stream-agnostic (with ability to extend to other chaining lambda APIs like Guava, RxJava, etc.); implemented for CompletableFuture; existing lambda is always preserved now.

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/extractStreamMap/afterGeneric.java

@@ -1,9 +1,9 @@
-// "Extract variable 'set' to separate stream step" "true"
+// "Extract variable 'set' to separate mapping method" "true"
 import java.util.*;
 import java.util.stream.*;
 
 public class Test {
   void testMap(List<Map<String, String>> list) {
-    list.stream().map(Map::keySet).flatMap(set -> set.stream()).forEach(System.out::println);
+      list.stream().map(Map::keySet).flatMap(set -> set.stream()).forEach(System.out::println);
   }
 }