Pause Connector in case of 500 and unauthorised error

[vivetiwa]

Summary

1. ConnectException thrown from publishAndLogIfRequired, since put method just groups the event based on flushTime and flushSize
2. Added is500 and isUnauthorized in HttpUtil class
3. After retry check if errorCode is 500 then throw HttpException else log and skip the message. since there could be chance that message failed from temporary 504-GatewayTimeout error in those case we just want to log and move ahead with processing
4. HttpException default error - 500
5. StringBuffer to StringBuilder since we don't need synchronized block inside method parameters
6. ContentHandler don't fail on intermittent failure
7. Bump up gradle release version

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Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [x] I have signed the Adobe Open Source CLA.
• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.