Support cancelling MultiplayerService session joining functions

Is your feature request related to a problem? Please describe.
It takes several seconds to join a session through MultiplayerService. I'd like to let users cancel a connection attempt during the connection process.

Describe the solution you'd like
I'd like to pass cancellation tokens to functions like MultiplayerService.Instance.CreateOrJoinSessionAsync.

Describe alternatives you've considered
I've tried preventing the NetworkManager from connecting to a session if my own connection function wrapping MultiplayerService.Instance.CreateOrJoinSessionAsync is cancelled, but I cannot find a clean way to do this. I have also considered modifying the Unity.Services.Multiplayer package myself, but I would rather not do this.

Nenhum arquivo ou teste é mencionado. Comece rastreando MultiplayerService.Instance.CreateOrJoinSessionAsync e o fluxo de conexão de NetworkManager para entender onde um token de cancelamento precisaria ser propagado. Considera-se concluído quando os usuários puderem cancelar a entrada em uma sessão em andamento por meio das funções de MultiplayerService sem precisar modificar o pacote por conta própria.