Backend service for bartender_frontend. Works with hardware controller bartender_arduino.

1. npm i
2. cp .env_sample .env
3. npm run start:dev

• finish recipe service;
• add Machine model, DAO, service - it should store and control the bartender bot config;
• create Machine provider, it should receive recipe definition and run it with Bartender provider;
• add graphql types / resolvers for manage entities slot, slots, liquids, machine;
• modify graphql resolvers for hardware interactions;
• add graphql subscribers to check machine statuses;