[PR] feat(aws): add SigV4a signing support [opendal-reqsign]

["Xuanwo (via GitHub)" <gi...@apache.org>]

Xuanwo opened a new pull request, #795:
URL: https://github.com/apache/opendal-reqsign/pull/795

   AWS SigV4 derives signing keys from a single region, so it cannot authenticate one request across multi-region AWS endpoints. SigV4a uses an asymmetric signing key and a signing region set to cover that use case.
   
   This adds a dedicated `reqsign-aws-v4a` signer and extracts credential providers plus canonicalization into `reqsign-aws-core`, keeping `reqsign-aws-v4` focused on HMAC SigV4. The facade retains the existing `reqsign::aws` API for compatibility and exposes explicit `aws::v4` and `aws::v4a` modules.
   
   The implementation supports header signing and query presigning, preserves the exact wire URI, and validates failure atomicity. It is cross-checked against AWS SigV4a key derivation vectors and the official Rust `aws-sigv4` implementation.
   
   This also makes the Aliyun default-provider unit test hermetic. Its final fallback previously reached the live ECS metadata endpoint during local workspace tests; the test now disables that unrelated provider and asserts that no HTTP request is made.
   


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Re: [PR] feat(aws): add SigV4a signing support [opendal-reqsign]

["Xuanwo (via GitHub)" <gi...@apache.org>]

Xuanwo merged PR #795:
URL: https://github.com/apache/opendal-reqsign/pull/795


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