[TASK] Implement pack, questions and answers endpoints in core

[MHDtA-dev]

Description

Implement endpoints related to interaction with packs, questions and answers as were discussed in endpoint structure

To do

• Implement packs, questions and answers endpoints

Notes

Acceptance Criteria

• Packs can be accessed, created, modified and deleted through endpoints
• Questions can be accessed, created, modified and deleted through endpoints
• Answers can be accessed, created, modified and deleted through endpoints
• Core service runs without errors