Extension for MQTTSessionManagerDelegate

[Corotata]

trafficstars

let user to decide wheather trigger reconnect,sometime when error.code == MQTTSessionErrorConnackBadUsernameOrPassword | MQTTSessionErrorConnackServeUnavailable,reconnect is unnecessary.

[jcavar]

I think your use case sounds reasonable to be implemented. I feel like didTriggerDelayedReconnectWithErrorshould be renamed to shouldTriggerDelayedReconnectForError or something like that.

I would also reverse condition so that we don't have empty if and we need some tests around this.