Syslog addition example. Taking syslog v001 as an example, the framework of syslog addition is shown.

there is a problem. We found that function "res_pjsip_send_ubus_event()"and its related content were merged into the source code through patch during the compilation process, but we checked with git status that this function and its related modifications are still uncommitted. These contents are also included in this MR. If your repository already contains the code of this function, the merge process may have problems