feat(iroh-net): Add helper fn to enable n0 discovery publishing and resolving

[rklaehn]

Description

Add a helper fn to configure n0 default discovery without having to resort to having to combine a custom discovery service.

let secret_key = SecretKey::generate();
let discovery = ConcurrentDiscovery::from_services(vec![
    Box::new(PkarrPublisher::n0_dns(secret_key.clone())),
    Box::new(DnsDiscovery::n0_dns()),
    Box::new(LocalSwarmDiscovery::new(secret_key.public())?),
]);
let ep = iroh_net::Endpoint::builder()
    .secret_key(secret_key)
    .discovery(Box::new(discovery))
    .alpns(vec![EXAMPLE_ALPN.to_vec()])
    .bind()
     .await

becomes

let ep = iroh_net::Endpoint::builder()
    .discovery_n0() // still have to do this to enable discovery!
    .alpns(vec![EXAMPLE_ALPN.to_vec()])
    .bind()
     .await

Breaking Changes

None

Notes & open questions

Should this be on or off by default?
Does anybody hate the name?
Should we also add fns for "just publish" or "just resolve" that I frequently need?

Change checklist

• Self-review.
• Documentation updates following the style guide, if relevant.
• Tests if relevant.
• All breaking changes documented.

[github-actions]

Documentation for this PR has been generated and is available at: https://n0-computer.github.io/iroh/pr/2775/docs/iroh/

Last updated: 2024-10-02T15:20:02Z

[github-actions]

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Last updated for commit: e846ec6