Add necessary query paramaters and responds body of endpoints in swagger

[husseljoo]

• for now the api docs are avaiable at /api-docs, however some necessary query paramaters are not displayed
• for instance:
  - name in app create/update
  - body in message create/update
• response body needs to be shown as well for instance:
  - {"chat__number": numValue}
  - {"message_number": numValue}