[F] Implement Investigation Questions and Answers

[kylepratuch]

Included in this PR:

• Question Entries. These aren't quite feature complete yet. There are two functional question/answer formats included here (text, select) and a third that is stubbed but not yet built out (fill in the blank). The idea here is to circle back and continue adding formats once our approach for data persistence is established.
• Answer Element type. A fairly simple record type for storing users' responses to questions. There's no UI for these in Craft, but one can be added down the road, if desired.
• Answer Element GQL support. Includes...
  A query: answers($userId, $investigationId)
  Two mutations: createAnswer($userId, $questionId, $investigationId, $data) and saveAnswer($id, $data)

TODO:

• Implement GQL schema scoping configuration
• Build out additional question types

[kylepratuch]

@blnkt @dananjohnson I said I would get these changes merged to develop before heading out of town, but after rebasing this branch on top of develop and dealing with all of the conflicts in project config that are typical during a rebase, I'm not able to apply configuration changes in my local craft instance.

I'm reluctant to go forward with the merge while this is happening, so I pushed the rebase to a temporary branch: temp/rebase-kp-questions. I'll plan to finish sorting this out when I'm back, but the branch is there if y'all want or need to do this before I'm back.

[kylepratuch]

Update: after restarting my container, all is well! Proceeding with the merge.