Problem

Customers need to be able to add their license file to a Coder deployment

Definition of Done

1. POST api/v2/licenses endpoint
2. CLI command coder licenses add <file>

Acceptance Criteria

Obtain a valid and invalid license file (you can create an invalid one by changing some of the letters in the license file)

1. Add the license
   coder license add <file>
2. Access the database.
   If you are using embedded postgres, you can get the connect string with:
   c server postgres-builtin-url
   If you are running external postgres, connect to it directly
3. Validate that a row is created in the licenses table
4. Add the invalid license
   coder license add <file>
5. Verify this command fails and no row is added.