[DP] added stream observable

added stream observable to encapsulate websocket and grpc calls

src/dependencies/angularlib

@@ -1 +1 @@
-Subproject commit 77048ca4109420153e1b9512b9565ba2a4675c0c
+Subproject commit 4bc40031fbb44d9112dcb9bbc355daf3d522725f

src/dependencies/dp-ui

@@ -1 +1 @@
-Subproject commit d53151c1962565484d18a5ab0974ac4a28b4641a
+Subproject commit 169c2a237ed589faf1684f715d686c6ae0b6ba3e