Zabbix

.......... [DEV-4147] made is easier to find source function from callback name (part 1)

Merge in ZBX/zabbix from feature/DEV-4147-7.3-2 to master

* commit 'e8bf5f26f590a2bb6b3f86ab629c02bd70bd99a0':
  .......... [DEV-4147] updated zbx_pp_notify_cb_t, finished_cb, preprocessor_finished_task_cb, finished_data and pp_worker_set_finished_cb
  .......... [DEV-4147] updated rtc_notify_cb
  .......... [DEV-4147] updated get_usage_stats()
  .......... [DEV-4147] updated walk_cb_func()
  .......... [DEV-4147] updated zbx_vault_kvs_get()
  .......... [DEV-4147] updated zbx_hashicorp_renew_token() and zbx_vault_kvs_renew_cb()
  .......... [DEV-4147] made is easier to find source function from callback name, part 2