consider making Endpoint::cancel_token public

[arilotter]

iroh/iroh/src/endpoint.rs

Line 1011 in 5aba17e

pub(crate) fn cancel_token(&self) -> &CancellationToken {

The cancel_token method in Endpoint is pub(crate) only.
It's used inside the Router to automatically shut down if the Endpoint is shut down, but this is a privilege uniquely granted to Router.

// We use a child token of the endpoint, to ensure that this is shutdown
// when the endpoint is shutdown, but that we can shutdown ourselves independently.
let cancel = endpoint.cancel_token().child_token();

End-user code with a custom accept loop is not able to see this cancel_token method, and thus is not able to automatically shut down should the Endpoint shut down.

I request that the cancel_token() method be made pub, so my end-user code can have the same behavior as Router and cleanly auto-shutdown.