Initialize this cell, i.e. set up mailboxes and supervision. The UID must be reasonably different from the previous UID of a possible actor with the same path, which can be achieved by using ThreadLocalRandom

public void Init(
	bool sendSupervise,
	MailboxType mailboxType
)

member Init : 
        sendSupervise : bool * 
        mailboxType : MailboxType -> unit