Configure snowflake stages in permifrost

Describe the feature

Maintaining snowflake stages can be difficult in code. It would be helpful if a user could configure a stage in permifrost and also specify external stages (S3 as an example)

Describe alternatives you've considered

Right now there is a terraform package that allows you to manage snowflake stages but the difficult thing here is that if you are using permifrost you are dealing with permissions across multiple tools

Who will this benefit?

The benefit here would be being able to manage more of your snowflake permissions in one place and not having stage permissions/access keys be handled in the UI. Devops might want to rotate AWS keys and if you have all your keys labeled in the UI this process could be quite painful. Also if you change a path that also would be a really tedious process if one has to do in the UI