Show cubejs query in MB sql query window and allow convert it to custom query

[norbertbede]

Is your feature request related to a problem? Please describe.
Metabase user ATM not allowed to view and convert cubejsquery to "metabase sql query" window. For more understanding cubejs query for BI administrator this missing well.

Workflow

1. BI admin create query in "Custom Question"
2. click to sql icon on right (to view query)
3. To modify query click to "Convert this questiion to sql" (for additional playing...create custom one - not allowed done in metabase wizard according to driver implementation level)

Describe the solution you'd like
show cubejs query in sql query window and allow convert it to custom query

label: ux