Adding a simulation option for leave request.

[boks1971]

@lukasIO I was thinking of making the simulation option just a LeaveRequest. And when simulating, client side can just set Action field of LeaveRequest. But, decided against it as I did not see the use case for it and also wanted to keep it simple/specific.

Let me know if I should change that to a generic LeaveRequest. If doing generic LeaveRequest, server behaviour would be

1. Action = DISCONNECT: server will close the participant and send a LeaveRequest with Action = DISCONNECT.
2. Action = RESUME, server will send LeaveRequest with Action = RESUME and it will not include self region in RegionSettings.
3. Action = RECONNECT, server will send LeaveRequest with Action = RECONNECT and it will not include self region in RegionSettings.

As the current simulation is only for full reconnect, it will behave like #3 above.

Also, this option will be supported only in cloud.

Please let me know if I should change this or just leave it as a boolean.

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