Add user journey from lobby to game (simplified)

[j-toscani]

Description (five sentences max.) I need to describe the life of a game lobby. This should be described by actions available on the backend. These actions should be functions so that it will be easy to later implement them with websockets. This Issue can be implemented over multiple PRs

• All possible user actions are defined by the backend.
• The game state only exists on the server
• The frontend has access to the least amount of information

Acceptance Criteria The following actions are implemented:

Lobby

• [x] Create Game Lobby
• [x] Join Game Lobby
• [x] Leave Game Lobby

Game

• [x] Get a Hand of Cards
• [x] Play a Card
• [x] Determine whose turn it is ~- [ ] Check Table~
• [x] Check playable cards
• [x] Check number of cards remaining in opponents hand
• [x] Determine the winner of a round
• [x] Determine the winner of a game
• [x] Get the results of a game
• [x] Check which player belongs to what party
• [x] Get information on the last "stich"

Out of Scope

• Websocket implementation
• No special game orders
• No callouts

Document optional improvements Optional. Could lead to a better feature.

[j-toscani]

If this issue is complete, I will create the first release.