feat: check out tokio channels

[erhant]

We may make use of channels for various reasons:

• Use a oneshot channel for cancellation, instead of tokens maybe
• More importantly, use channels to sync between threads such as for P2P and Node.

Relevant links:

• https://tokio.rs/tokio/tutorial/channels
• https://docs.rs/tokio/latest/tokio/sync/oneshot/fn.channel.html
• https://cybernetist.com/2024/04/19/rust-tokio-task-cancellation-patterns/

[erhant]

Cancellation works well, closing this.