New File API with added enhancements

Added

• New File API:
  • GET /v2/whiteboards/{whiteboardId}/files/{fileId}

Enhancements

• New invite_message request field in the following Project API:
  • POST /v2/whiteboards/projects/{projectId}/collaborators
• New skip_notifications request field in the following Project APIs:
  • POST /v2/whiteboards/projects
  • POST /v2/whiteboards/projects/{projectId}/collaborators