passing object info information with redis module (#138)

* adding object broadcast channel; published on each object table add

* publishing data size to the bcast channel

* bug fix: objectkey

* update object tests to test for data size: C + py

* remove debug

* clang format

* Minor changes.

* Fix error.

* merging with Robert's comments

* clang format for the object table test upgrade

src/plasma/plasma_manager.c

@@ -963,6 +963,7 @@ void object_present_callback(object_id object_id,
 /* This callback is used by both fetch and wait. Therefore, it may have to
  * handle outstanding fetch and wait requests. */
 void object_table_subscribe_callback(object_id object_id,
+                                     int64_t data_size,
                                      int manager_count,
                                      const char *manager_vector[],
                                      void *context) {
@@ -1378,7 +1379,7 @@ void start_server(const char *store_socket_name,
                       handle_new_client, g_manager_state);
   /* Set up a client-specific channel to receive notifications from the object
    * table. */
-  object_table_subscribe_to_notifications(g_manager_state->db,
+  object_table_subscribe_to_notifications(g_manager_state->db, false,
                                           object_table_subscribe_callback,
                                           g_manager_state, NULL, NULL, NULL);
   /* Run the event loop. */