Issue 194/make sure users dont get created twice

[burkkyy]

Fixes #194

Context

Users were being created twice by a race condition from loadUser in api/src/middleware/authz.middleware.ts

Implementation

• Replaced api/src/middleware/authz.middleware.ts with api/src/middleware/authorization-middleware.ts
• Split up functionality in api/src/middleware/authorization-middleware.ts.
• Added transaction to api/src/middleware/authorization-middleware.ts
• Fixes/added testing
• user creation caching to mitigate race condition

Testing Instructions

dev test middleware

Additional Information

• api/src/middleware/authorization-middleware.ts is hardened againt +1000 requests at once.
• Even with 1000 concurrent requests only 1 user is created. See screenshot below.

Screenshot