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/afterBoxed.java

@@ -1,9 +1,9 @@
-// "Extract variable 'l' to separate stream step" "true"
+// "Extract variable 'l' to separate mapping method" "true"
 import java.util.*;
 import java.util.stream.*;
 
 public class Test {
   Object[] testBoxed(int[] x) {
-    return Arrays.stream(x).asLongStream().boxed().toArray();
+    return Arrays.stream(x).asLongStream().mapToObj(l -> l).toArray();
   }
 }