## Description
In order to use the api layer as an interface, we
need the functions therein to be methods, so
that callers can leverage local interfaces. This
change introduces the api.Client, and begins
to spread it throughout the exchange package,
largely in place of graph servicers.
No logic changes have occurred here. The only
modifications are what is required to utilize the
api client.
## Does this PR need a docs update or release note?
- [x] ⛔ No
## Type of change
- [x] 🤖 Test
## Issue(s)
* #1967
## Test Plan
- [x] ⚡ Unit test
- [x] 💚 E2E
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