Create a daily digest with newly reported content

**Is your feature request related to a problem? Please describe.**

It can be quite tedious to deal with moderations one email notification at a time. Especially when they are numerous.

**Describe the solution you'd like**

Send a daily digest with all the new content to moderate and a button to manage it.

**Describe alternatives you've considered**

Email filters directly configured in the inbox.

**Additional context**

**Does this issue could impact on users private data?**

No

**Funded by**

EU Commission