A Stream is a continuous transmission of data.
An item is a single structure. Crossing the two
definitions generates confusion.
Primarily code movement/renaming. Though there
is also some reduction/replacement of structs
where we'd made a variety of testable Item implementations
instead of re-using the generic mock.
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#### Does this PR need a docs update or release note?
- [x] ⛔ No
#### Type of change
- [x] 🧹 Tech Debt/Cleanup
#### Test Plan
- [x] ⚡ Unit test
- [x] 💚 E2E
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