[Feature Request] Implement OAuth flow

[michaeldcanady]

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N/A

Describe the solution you'd like A clear and concise description of what you want to happen.

1. Have the user go to /authorize with the following query parameters:

   client_id: str
   response_type: str
   redirect_uri: str
   scopes: List[str] = .default
   response_mode: str = "code"
   state: Optional[str] = None

2. Have a authorizationCodeDB class, with a get_code method that takes in the scopes and state parameters.

3. The get_code method generates a code, checks if code is globally unique, if so it writes the code as an entry in the DB, with the expiration date, and the state code.

4. The get_code method returns the state code and authorization code

5. /authorize, redirects to the provided redirect url, with the following parameters:

   code: str
   state: Optional[str]
   session_state: str

6. User posts to /token with the follow body:

   {
   "grant_type": str,
   "client_id": str,
   "client_secret": str,
   "code": str,
   "redirect_uri": str,
   "scope": str
   }

7. Have authorizationCodeDB with a check_code method that takes code and scope. It checks the code against the database table, makes sure the code isn't expired and the scopes match.

8. /token returns the following response:

{ "token_type": "Bearer", "scope": "user.read%20Fmail.read", "expires_in": 3600, "access_token": "eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsIng1dCI6Ik5HVEZ2ZEstZnl0aEV1Q...", "refresh_token": "AwABAAAAvPM1KaPlrEqdFSBzjqfTGAMxZGUTdM0t4B4..." }

Additional context
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