- Extract SQLEditor.execute and SQLEditor._poll into their own files and add test around them
- Extract SQLEditor backend functions that start executing query to their own files and add tests around it
- Move the Explain SQL from the front-end and now pass the Explain plan parameters as a JSON object in the start query call.
- Extract the compile_template_name into a function that can be used by the different places that try to select the version of the template and the server type
