[sr-dev] git:master: core: new parameters to control and alert on time consuming ops

- latency_log - log level to print the messages related to latency - latency_limit_db - limit of latency in ms for db operations. If a db operation executed via DB API v1 takes longer that its value, a message is printed in the logs, showing the first 50 characters of the db query - latency_limit_action - limit of latency in ms for config actions. If a config action executed by cfg interpreter takes longer than its value, a message is printed in the logs, showing config path, line and action name when it is a module function, as well as intenal action id