Add wstd-azure crate for Azure SDK integration

[Copilot]

Adds support for using the Azure Rust SDK on wasm32-wasip2 target via wstd's wasi-http interface.

Implementation

Created wstd-azure crate following the pattern established in wstd-aws PR bytecodealliance#102, adapted for Azure SDK's architecture:

• AsyncRuntime - Implements typespec_client_core::async_runtime::AsyncRuntime mapping to wstd's task spawning (wstd::runtime::spawn) and timing (wstd::task::sleep)
• HttpClient - Implements typespec_client_core::http::HttpClient using wstd's wasi-http client, converting between Azure SDK types and wstd HTTP types

Key differences from AWS implementation:

• Azure uses typespec_client_core traits vs AWS's aws-smithy traits
• Duration conversion handles time crate types vs std::time::Duration
• HTTP response uses BufResponse::from_bytes() vs streaming responses

Usage

use wstd_azure::{set_wstd_runtime, http_client};

#[wstd::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    set_wstd_runtime()?;
    
    let client = http_client();
    // Use client with Azure SDK service clients via .with_http_client(client)
    
    Ok(())
}

Changes

• Added azure/ workspace member with lib, README, and example

• Workspace dependencies: typespec_client_core, azure_core, azure_storage_blob (v0.6), async-trait

• Returns error for unsupported HTTP methods instead of silent fallback

• Fixes add wstd-azure crate #1

Original prompt

---

This section details on the original issue you should resolve

<issue_title>add wstd-azure crate</issue_title>
<issue_description>Create a wstd-azure crate following a structure similar to the wstd-aws crate:

• add wstd-aws crate, for integration with aws-sdk bytecodealliance/wstd#102

There are two extension points that need to be implemented:

• azure_core::async_runtime::AsyncRuntime
  documented at https://docs.rs/azure_core/latest/azure_core/async_runtime/trait.AsyncRuntime.html
• azure_core::http::HttpClient
  documented at https://docs.rs/azure_core/latest/azure_core/http/trait.HttpClient.html

I created a working example of implementing both using the Spin SDK in

• experiment to add support for wasm32-wasip2 using Spin Azure/azure-sdk-for-rust#2974

Instead of the Spin SDK, use wstd.
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes add wstd-azure crate #1

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[cataggar]

@copilot, change target branch to be wstd-azure.

[Copilot]

@copilot, change target branch to be wstd-azure.

I cannot change the PR target branch directly as that's a GitHub interface setting. The target branch needs to be changed through the GitHub PR web interface. You can do this by:

1. Going to the PR page on GitHub
2. Clicking "Edit" next to the target branch name
3. Selecting wstd-azure as the new target branch

The wstd-azure branch exists on the remote and the current changes should be compatible with it.

[cataggar]

@copilot this is the old crate. Instead, use azure_storage_blob. There are examples in the docs https://docs.rs/crate/azure_storage_blob/latest
There are also example to create a container and upload a blob in this test:
https://github.com/Azure/azure-sdk-for-rust/blob/main/sdk/storage/azure_storage_blob_test/src/lib.rs

[Copilot]

Updated to use azure_storage_blob v0.6 instead of the deprecated azure_storage_blobs v0.21. Changes made in commit 1bacd67:

• Workspace dependency updated in Cargo.toml
• Dev-dependency updated in azure/Cargo.toml
• Example documentation updated to reference the correct crate name

The code compiles successfully for both native and wasm32-wasip2 targets.

[pchickey]

It looks like Copilot was able to do the easy part. This will need an integration test hooked up in test-programs/tests/azure_blob_storage.rs with the auth machinery working in CI.