Description

It adds support for application/json mime type in statement output since Livy PySpark kind has %json magic command which return json with application/json mime type in statement output

Checklist

• Wrote a description of my changes above
• Formatted my code with black
• Added a bullet point for my changes to the top of the CHANGELOG.md file
• Added or modified unit tests to reflect my changes
• Manually tested with a notebook
• [N/A] If adding a feature, there is an example notebook and/or documentation in the README.md file