Remove futures-lite

[edfloreshz]

This pull request removes futures-lite in favor of async-std as we are already using it with ashpd, fixes issues with the Error enum and removes unnecessary dependencies.

Improvements:

• src/platforms/freedesktop.rs: Implemented timeout handling using async-std in the detect function to avoid latency issues.
• src/error.rs: Updated Error enum and related implementations to support FreeBSD, DragonFly, NetBSD, and OpenBSD in addition to Linux.
• src/error.rs: Added a new Timeout variant to the Error enum to handle timeout errors.
• Cargo.toml: Updated dependencies by removing futures-lite and tokio, and adding async-std.

Fixes #17