Adds an interface for GetUserInfo, which gets
corso-specific metadata for a single user. Also
does some refactoring around discovery for
better interface consistency, both as variables
and as access layers.
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#### Does this PR need a docs update or release note?
- [x] ⛔ No
#### Type of change
- [x] 🌻 Feature
#### Test Plan
- [x] ⚡ Unit test
- [x] 💚 E2E