Replace gloo-timers with futures-timer

[NumberFour8]

What

• Migrated Sleeper implementation from gloo-timers to async runtime-agnostic futures-timer

• Adjusted feature flags and updated dependencies to reflect this change, ensuring seamless functionality across different environments:

  • gloo-timers-sleep feature kept for backwards compatibility, it will imply the automatically futures-timer-sleep

  • if wasm32 architecture is detected, it automatically enables the gloo-timers + wasm-bindgen features on futures-timer crate to ensure WASM compatibility.

Closes #153

[Xuanwo]

Thank you for your PR. But I prefer to keep gloo-timers feature as is and only add a new feature for futures-timer.

[NumberFour8]

Thanks for the comments. I will improve it.

[NumberFour8]

@Xuanwo I pushed some changes.

Let me know if a type alias for GlooTimersSleep is acceptable, or whether you'd like to have the whole previous implementation of the struct restored.

[Xuanwo]

Let me know if a type alias for GlooTimersSleep is acceptable, or whether you'd like to have the whole previous implementation of the struct restored.

Thank you for your efforts; I prefer to leave them unchanged.