[orc-rt] Replace wrapper fn `void *CallCtx` arg with `uint64_t CallId`. (#167452)

This argument serves as an opaque id (outside the ControllerAccess
object) for a call to a wrapper function. I expect that most
ControllerAccess implementations will want to use this argument as a
sequence number (plain integer), for which uint64_t will be a better fit
than void*. For ControllerAccess implementations that want to use a
pointer, uint64_t should be sufficiently large.

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