Scope out email forwarding of requests as a feature

[patrickod]

It'd be great if we could reduce the steps required to file a FOIA by one by removing the "copy and paste into your email client" workflow, and instead just send emails to the respective agencies on behalf of people, and then forward their responses on.

There's a bunch of caveats to doing this

1. dealing with spam / other abuse
2. needing some sort of identity layer to associate requests&emails with people
3. it introduces a strict need for some state storing, which we currently don't have.

Even with that (non-exhaustive) list of caveats I still think we can make this a really awesome featuer.