Resolve "Add api for alternatives and answers"

server/app/apis/__init__.py

server/app/apis/alternatives.py

server/app/apis/answers.py

server/app/apis/questions.py

server/app/core/dto.py

server/app/core/parsers.py

server/app/core/rich_schemas.py

server/app/core/schemas.py

server/app/database/controller/add.py

server/app/database/controller/copy.py

server/app/database/controller/edit.py

server/app/database/controller/get.py

server/app/database/models.py

server/populate.py

server/tests/test_db.py