## Description
Adds the per item collection streaming calls to
the api interface. Primarily migrates a "getItem"
and a "serializeItem" acton into the api pkg, out
from exchange_data_collection. Building an
ExchangeInfo is now also housed in api.
## Does this PR need a docs update or release note?
- [x] ⛔ No
## Type of change
- [x] 🧹 Tech Debt/Cleanup
## Issue(s)
* #1996
## Test Plan
- [x] ⚡ Unit test
- [x] 💚 E2E
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