[FEATURE] Users Mock API

[ReznikovRoman]

Description
Create all user related endpoints.

Possible solution

1. Add all the necessary API handlers for working with users:
   • create user: HTTP POST: /users
   • get user data: HTTP GET: /users/{id}
   • register user: HTTP POST: /register
2. For now, let's mock all interactions with Accounts service, use fake data where needed
3. Use dependency-injector as a DI framework
   • Use fork of dependency-injector that supports Python 3.12

Additional context

• Project description
• SQLAlchemy ORM docs
• FastAPI docs
• FastAPI + ORMs docs
• FastAPI project example
• DI + FastAPI + SQLAlchemy tutorial