Refactor xml response handler to handle SdkPojo

[zoewangg]

Context

This is needed to support event streaming for services using xml protocol. #859

Description

• Refactored xml response handler to handle SdkPojo (event stream type)
• The structure of the related xml classes now matches with the one of the json classes.
  • AwsXmlResponseHandler & AwsJsonResponseHandler: delegates to the underlying response handler and adds response metadata
  • XmlResponseHandler & JsonResponseHandler: AwsResponse ignorant, unmarshalls the response.

Testing

Added unit tests

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 read the README document
• I have added tests to cover my changes
• All new and existing tests passed
• A short description of the change has been added to the CHANGELOG
• 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

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

94.4% Coverage
0.0% Duplication