Mc 508 create user user id get endpoint

[maxachis]

Fixes

• Create /user/{user_id} GET endpoint data-sources-app#508

Description

• Create user/{user_id} GET endpoint, and associated logic, tests, and documentation
• Refactor test generation and management logic.

Testing

• Run tests in tests directory to confirm functionality
• Inspect API to confirm expected content in user/{user_id} GET

Performance

• Test overhead increased

Docs

• API documentation added

Breaking Changes

• No breaking changes.