Migration scripts

[lmarini]

Ideally through the API. Too slow? Should we do directly to Mongo?

### Tasks
- [ ] https://github.com/clowder-framework/clowder2/issues/1070
- [ ] https://github.com/clowder-framework/clowder2/issues/1071
- [ ] https://github.com/clowder-framework/clowder2/issues/978
- [ ] https://github.com/clowder-framework/clowder2/issues/1072
- [ ] https://github.com/clowder-framework/clowder2/issues/1073

[lmarini]

Duplicate of #610