Implement Account and Character Sheet Controllers

[megw-school]

Account Controller

• Manage read/write/deletes with the Firestore accounts collection. User's accounts are identified through their UID.
• This will actually interact with the Firestore database and will required ID tokens

Character Sheet Controller

• Manages converting CharacterDetails into a 5e compliant character sheet. On the backend this will pass CharacterDetails to GPT API as well as 5e helpers that calculate derived values and perform checks against the character sheet.
• Since the character sheet controller is dependent on helper functions, set it up with dummy data to facilitate front end development.