[meta] Improve and formalize Data Review process esp for Core Datasets

[rufuspollock]

As part of data curation for core datasets we already have an informal review process in the quality assurance phase:

https://datahub.io/docs/core-data/curators-guide#3-quality-assurance

We could improve and expand on this e.g.

• Define a list of reviewers
• Create a checklists to be passed etc

Inspiration

https://github.com/ropensci/software-review

https://github.com/ropensci/software-review/issues/201