Different methods for different Data Requests.

[tse-lao]

We want to build a mode modular way of requesting data for datasets.

For instance:

• We want a data requester to only select a certain group of whitelisted people to contribute <-- might be done with your implementation of repos.
• We want a data requester to accept individual data contributions based on valid answer, this also need to be specified in workflow.
• we want a data requester to request for open data that is visible for everyone.
• we want a data requester to request for private data that is visible for no one, and preferably not even visible for the data requester itself.