[FE-6127] Delete Database

[henryfauna]

Ticket(s): FE-6127

Problem

We do not support the fauna database delete command yet.

Solution

• Wire up this command following the patterns established by fauna database create.
• Ensure we handle some of the common error scenarios a user might run into. For example, the database does not exist.

Result

You can delete a database using fauna database delete --name <db_name> --secret <parent_db_secret>

Out of Scope

Authenticating with the credentials vended by fauna login.

Testing

Added units to ensure we handle args correctly and call fauna/handle errors correctly.