add api, Unregister, QueryTopicAddress.

lichao

2021-04-23 65a230ec6ccb61c3ce6816730da2106f07f40b4a

 src/bh_api.h

@@ -24,12 +24,24 @@
               int *reply_len,
               const int timeout_ms);

int BHUnregister(const void *proc_info,
                 const int proc_info_len,
                 void **reply,
                 int *reply_len,
                 const int timeout_ms);

int BHRegisterTopics(const void *topics,
                     const int topics_len,
                     void **reply,
                     int *reply_len,
                     const int timeout_ms);

int BHQueryTopicAddress(const void *topics,
                        const int topics_len,
                        void **reply,
                        int *reply_len,
                        const int timeout_ms);

int BHSubscribeTopics(const void *topics,
                      const int topics_len,
                      void **reply,