This adds 2 new topics (if activated by config), namely
- `{kafka_prefix}.release:anonymized` and
- `{kafka_prefix}.revision:anonymized`
These topics are filled aside from their original non-anonymized version.
The anonymization process consists simply in forging a Person with the
`fullname` being a hash of the triplet (fullname, name, email) of the
original Person in Release and Revision entities.
So the replayer process can be used as is (just have to not replay both
standard and anonymized topics at once).
Depends on D3140.