MVP Data Paths

[Terkwood]

With the POC finished, we need to add four data paths to support a full featured system:

• Back-end: Wait for Public Game (req) / public Game found (reply)... For people who want to queue in the lobby (🛠 🏞 💾 Add kafka-streams support for game lobby #78)
• Back-end: private games (🛠 🏞 💾 Add kafka-streams support for game lobby #78)
• Front-end & gateway: Private games joining (Allow joining private games via link  #53)
• write open games to changelog as soon as they're created (🛠 🏞 💾 Add kafka-streams support for game lobby #78)
• Gateway: swap envy for dotenv Gateway: Add dotenv #97
• color choice: UI and gateway support Gateway & Sabaki: support color choice #84 / Sabaki: modal dialog for color choice  #65
• Allow logical color choice  #63 choose color / color chosen backend

enum Visibility { Public, Private} 

struct OpenGame {
  gameId: GameId, visibility: Visibility
} 

We'll need a GameLobby to keep track of all games, public and private, in a global KTable

Whenever a game is joined, it's removed from that list 📃

[Terkwood]

Related : #7

[Terkwood]

Done. Debt in #86