V4a async payload signing

[dagnir]

Motivation and Context

This PR adds support for async payload signing in the V4a signer. Note an important difference to the V4 implementation: This supports the fallback to signing the payload when the request is sent over http. This is because calling the signAsync() method previously always threw UnsupportedOperationException, so there is no risk of performance regression for existing users.

Modifications

Testing

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed
• I have added a changelog entry. Adding a new entry must be accomplished by running the scripts/new-change script and following the instructions. Commit the new file created by the script in .changes/next-release with your changes.
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• I confirm that this pull request can be released under the Apache 2 license

[dagnir]

Per API review, doing a minor version bump since mismatched (new) http-auth-aws and (old) crt-core may be an issue.

[sonarqubecloud]

Quality Gate passed

Issues
20 New issues
0 Accepted issues

Measures
0 Security Hotspots
87.0% Coverage on New Code
0.3% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

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