1. moves the m365/graph package from internal to pkg/services/api so that options are accessible to sdk users.
2. exposes graph.Options in the api client.Service call.
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#### Does this PR need a docs update or release note?
- [x] ⛔ No
#### Type of change
- [x] 🌻 Feature
adds basic get requests for the conversations api set to the api package. Plust some other minor change for formatting, correctness, or necessity.
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#### Does this PR need a docs update or release note?
- [x] ⛔ No
#### Type of change
- [x] 🌻 Feature
#### Issue(s)
* #4536
#### Test Plan
- [x] 💪 Manual
- [x] ⚡ Unit test
- [x] 💚 E2E