feat: impl IntoFuture for requests

[tqwewe]

Ask and tell requests can now be awaited directly, eliminating the need for .send().await. This change simplifies the API while retaining the same functionality.

Before:

actor_ref.tell(MyMessage).send().await?;

After:

actor_ref.tell(MyMessage).await?;

The previous syntax remains valid but is now unnecessary, making the code cleaner and more intuitive.