refactor(core): reduce dependency on futures

[0x676e67]

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[Copilot]

Pull Request Overview

This PR refactors the codebase to reduce dependency on the futures crate by replacing it with futures-util and tokio alternatives. The main goal is to minimize external dependencies while maintaining the same functionality.

• Replaced futures::channel::{mpsc, oneshot} with tokio::sync::{mpsc, oneshot}
• Implemented a custom ReceiverStream wrapper to provide Stream trait functionality
• Updated method signatures to use futures_util::Stream instead of futures::Stream

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/rt/sync.rs	Implements custom ReceiverStream and updates channel usage to tokio
src/rt/mod.rs	Updates imports and return types to use new stream implementation
Cargo.toml	Comments out the futures dependency

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