refactor: replace Box::pin with core::pin::pin!

[Peponks9]

Refactor all instances of Box::pin with core::pin::pin! in the time.rs file. The changes ensure stack-pinning of futures for better performance while maintaining the same functionality.

Changes Made

• Updated send_after and send_interval functions to use pin! for futures and async blocks.
• Added let bindings for pinned values to resolve compilation errors related to temporary borrowing.
• Ensured the code compiles without issues and preserves the original behavior.

Files Changed
time.rs

Testing

• Verified compilation with cargo check.
• All tests by running cargo test still passing.

Closes #50
cc @MegaRedHand

[MegaRedHand]

Good work! Left some comments about style.

[Peponks9]

thanks for the feedback @MegaRedHand, changes made to align with comments

[Copilot]

Pull Request Overview

This PR refactors the time.rs file to replace Box::pin with core::pin::pin! macro for stack-pinning futures, which improves performance by avoiding heap allocation while maintaining the same functionality.

• Replaced all Box::pin calls with core::pin::pin! macro
• Added explicit let bindings for pinned futures to resolve compilation issues with temporary borrowing
• Simplified nested async block structures for better readability

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[Peponks9]

Hi @MegaRedHand, all set with signed commits. I had some trouble with signing keys but resolved now. Thanks