[biomed nl] add debug info and context messages

[chejennifer]

• add entities and props to the debug info pane
• return user messages when using context for entities or props
  • using entities from context: https://screenshot.googleplex.com/AJ2hgmcdQqXVX3v
  • using props from context: https://screenshot.googleplex.com/9Pj3vCWWfSvBN5p