Add DataView#streamRootKeys

Author: aromaa

src/main/java/org/spongepowered/api/data/persistence/DataView.java

@@ -107,6 +107,15 @@ public interface DataView {
      */
     Set<DataQuery> keys(boolean deep);
 
+    /**
+     * Gets a Stream containing all root keys for this {@link DataView}.
+     *
+     * @return Stream of root keys of this container
+     */
+    default Stream<String> streamRootKeys() {
+        return this.keys(false).stream().map(k -> k.parts().getFirst());
+    }
+
     /**
      * Gets a Map containing all keys and their values for this {@link DataView}.
      *