Update Deck Model

[iambroadband]

Issue #24

Description

We have a baseline Deck model now, but we need some of the following:

1. Validation
   • We should be validating the incoming data. We need to make sure that when we use .add_card(Card), it maintains a valid state
   • We need to make sure that the default values for each field are valid and make sense
2. Testing
   • We need to add tests for all of the functionality of a Deck model.
   • These tests should use a real decklist and not something that's just a few cards.
3. Write tickets for follow-up steps
   • We will need to create database endpoints and routers for Deck objects in the database. Write tickets to implement those

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• Added some validation for deck size based on Format.
• Added more tests for Deck, including tests on the validations
• Created the following tickets as follow-ups:
  • Update Deck Model to use DecklistCard instead of Card
  • Create CRUD database endpoints for Deck
  • Create Deck Router