Invoice service for MiSArch

Quickstart (DevContainer)

1. Open VSCode Development Container
2. cargo run starts the GraphQL service + GraphiQL on port 8080

Quickstart (Docker Compose)

1. docker compose -f docker-compose-dev.yaml up --build in the repository root directory. IMPORTANT: MongoDB credentials should be configured for production.

What it can do

1. Listens to the discount/order/validation-succeeded event
2. Creates Invoice and saves it in MongoDB
3. Emits invoice/invoice/created event