feat(core/httpAuthSchemes): set configuration sources for sigv4a signingRegionSet

[kuhe]

Issue

JS-4976

Description

This adds a config resolver for sigv4a and its config field "sigv4aSigningRegionSet" which is an optional list of AWS regions.

usage:

  const s3 = new S3({
    region: "us-west-2",
    sigv4aSigningRegionSet: ["us-west-2", "us-east-1"],
  });

This is quite optional at this point, because endpoint resolution for Amazon S3 always returns a signingRegionSet of * if resolving the auth scheme to sigv4a. This will support future developments in multi-auth and expanded usage of sigv4a.

Testing

• ci
• e2e
• e2e:legacy

Checklist

• If you wrote E2E tests, are they resilient to concurrent I/O?
• If adding new public functions, did you add the @public tag and enable doc generation on the package?

[github-actions]

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