[CAL-3951] Add input to change instant meeting duration

[Udit-takkar]

Is your proposal related to a problem?

An input box in org event type settings to add waiting time for instant meeting

Requested by https://calcominc.slack.com/archives/C04CWEU35NV/p1718298091875219

_{From SyncLinear.com | CAL-3951}

[kmaity-9563]

hey i want to work on it