Use async rust extensions

[jprendes]

No description provided.

PR Overview

This pull request refactors a large portion of the codebase to use asynchronous Rust extensions. Key changes include converting many functions (in instances, tasks, and tests) to asynchronous equivalents, updating dependency declarations to include Tokio from the workspace, and modifying event‐sending traits to return and work with futures.

Reviewed Changes

File	Description
crates/containerd-shim-wasm/src/sandbox/cli.rs	Converted several Shim methods (e.g. new, start_shim, wait) to async functions with updated await semantics.
crates/containerd-shim-wasm/src/sandbox/shim/events.rs	Changed the EventSender trait from a synchronous send method to an async function returning a future.
crates/containerd-shim-wasm/src/sandbox/shim/local/tests.rs	Updated tests to use Tokio’s async channels and task spawning ensuring proper awaits throughout the test lifecycle.
crates/containerd-shim-wasm/src/sandbox/instance_data.rs	Replaced std::sync::RwLock with tokio::sync::RwLock and adjusted all lock acquisitions to be awaited.
Various Cargo.toml files (wasmedge, wamr)	Added Tokio as a dependency from the workspace to ensure consistent async runtime support.

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