Manage endpoints updated to support Tokens

[jpvajda]

Manage endpoints that will likely change:

• request - https://developers.deepgram.com/reference/get-request
• requests - https://developers.deepgram.com/reference/get-all-requests
• usage - https://developers.deepgram.com/reference/summarize-usage
• fields - https://developers.deepgram.com/reference/get-fields

[jpvajda]

@CopperBeardy I've confirmed there are no changes to these endpoints in terms of query parameters or fields the change is the response body. You can actually see the new response by querying these endpoints now.

[dvonthenen]

Merged PR #226. Closing