Foreign keys must be read-write

[moaazelsayed1]

For example in Message schema the client should set the channel_id, parent_message_id, and workspace_id.

sender_id:
          type: string
          format: uuid
          readOnly: true
channel_id:
          type: string
          format: uuid
          readOnly: true
parent_message_id:
          type: string
          format: uuid
          readOnly: true
workspace_id:
          type: string
          format: uuid
          readOnly: true