Resolve "Add command to backup database"

Merge Request Checklist

• changelog.md has been updated if required
• Documentation has been updated
• Quality Standards are met
• The UI/UX has been updated following UI Style Guide
• The redoc API pages have been updated for any REST API changes
• The per database user API docs page has been updated for any REST API changes made to endpoints which can be accessed via a user created token
• Has performance been considered and tested when appropriate? Ideally Baserow should be performant when working with hundreds of thousands of rows
• New/Changed Premium features are separated correctly in the premium folder

Testing Performed

• Can backup a baserow, mess up a local database deleting things, and then do a restore to get it back to the same state
• Can backup staging in a reasonable amount of time
• Can backup remotely
• Can backup a local docker setup

Closes #538 (closed)