Confbridge: Add a user timeout option

This option adds the ability to specify a timeout, in seconds, for a
participant in a ConfBridge. When the user's timeout has been reached,
the user is ejected from the conference with the CONFBRIDGE_RESULT
channel variable set to "TIMEOUT".

The rationale for this change is that there have been times where we
have seen channels get "stuck" in ConfBridge because a network issue
results in a SIP BYE not being received by Asterisk. While these
channels can be hung up manually via CLI/AMI/ARI, adding some sort of
automatic cleanup of the channels is a nice feature to have.

ASTERISK-25549 #close
Reported by Mark Michelson

Change-Id: I2996b6c5e16a3dda27595f8352abad0bda9c2d98

apps/confbridge/include/confbridge.h

@@ -140,6 +140,8 @@ struct user_profile {
 	unsigned int talking_threshold;
 	/*! The time in ms of silence before a user is considered to be silent by the dsp. */
 	unsigned int silence_threshold;
+	/*! The time in ms the user may stay in the confbridge */
+	unsigned int timeout;
 };
 
 enum conf_sounds {