Cargo: Use futures-util and futures-channel to replace futures crate

[cathay4t]

The futures crate contains more than we needs, this patch use
futures-channel and futures-channel instead.

[gemini-code-assist]

Summary of Changes

Hello @cathay4t, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the project's asynchronous programming dependencies. By replacing the comprehensive futures crate with its more modular counterparts, futures-util and futures-channel, the change aims to reduce the overall dependency footprint and improve compilation efficiency. This ensures that only the specifically required asynchronous utilities are included, leading to a leaner and potentially faster build process.

Highlights

• Dependency Refactoring: The monolithic futures crate has been replaced by its more granular counterparts, futures-util and futures-channel, in the Cargo.toml file.
• Import Path Updates: All use statements across the codebase that referenced components from the futures crate (such as TryStreamExt, StreamExt, TryStream, channel::mpsc::UnboundedReceiver, and future::err) have been updated to correctly point to futures-util or futures-channel.

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[gemini-code-assist]

Code Review

This pull request correctly replaces the futures crate with the more specific futures-util and futures-channel crates, which helps in reducing the dependency footprint. The changes across the source files are consistent with this goal. My main feedback is regarding the versions of the new dependencies in Cargo.toml, which are quite outdated; I've suggested updating them to more recent versions. Also, there's a small typo in the pull request description where futures-channel is mentioned twice instead of futures-util and futures-channel.

[gemini-code-assist]

The versions specified for futures-util and futures-channel (0.3.11) are outdated. Using old versions of dependencies can introduce security vulnerabilities and bugs that have been fixed in newer releases. Please update to a more recent version, for example, 0.3.30.

Suggested change

	futures-util = "0.3.11"
	futures-channel = "0.3.11"
	futures-util = "0.3.30"
	futures-channel = "0.3.30"