Reduce the responsibilities of the repository db
After creating file structures that allow to archive repository metadata #80 (closed), we could move some data from the repository db to files and (partially)create the repository search index from there.
This requires to adopt the existing repository search API
- coe->fairdi migration of repoTool
- coe->fairdi migration of repoWebservice
- Implementation of user metadata change notification API endpoint
- User metadata API endpoints