Issue 495: Add default values for query builder inside connection settings

[lunaticusgreen]

fix #495

[antip00]

Issues:

• Can't create new datasource, save and test button returns nothing
  
  

• I think we need to move default database to other section
  

[lunaticusgreen]

@antip00 Thank you! both problems are fixed

[Slach]

could run git pull origin master?

[Slach]

@lunaticusgreen

https://github.com/Altinity/clickhouse-grafana/actions/runs/9567400079/job/26375045064?pr=567
test failed
"Save and Test" button return nothing, expect error, look to screenshot