Back End: Add more contact fields to DonationRequest model

[shawnadelic]

Here is the prototype for the request form, there is an option to indicate who the donation request is for (yourself or someone else):

https://projects.invisionapp.com/share/YKH1L8TAB56#/screens/291941063

We currently don't have a field to store this info, so our data model needs to be updated.

Not sure if we should store a boolean value indicated whether it's a self-request (something like is_self_request), as well as an additional field for the requester's name, or just the requester's name, which could either leave blank or fill in with their name if it is a self-request.

I'm leaning toward the former option since it gives more info.

[wlaoh]

@shawnadelic do you mean an additional field for the recipient's name?

[wlaoh]

Also do you think we should validate against is_self_request, if there's a recipient name present, or do you think its enough to just hide/disable recipient name input while the self request front end is true?