* Remove Result field from AddDataSourceCommand
* Remove DatasourcesPermissionFilterQuery Result
* Remove GetDataSourceQuery Result
* Remove GetDataSourcesByTypeQuery Result
* Remove GetDataSourcesQuery Result
* Remove GetDefaultDataSourceQuery Result
* Remove UpdateDataSourceCommand Result
* init
* support template variables
* support variables without curly braces
* add todo for `__all` case
* fix `$__all` case for non-multivalue
* extract some functions
* fix flakinesss
* support `$__all` and `default` template variables
* add todo
* compilation fix
Co-authored-by: Ryan McKinley <ryantxu@gmail.com>