Add support for getting OAuth token info

[mrashed-dev]

Description

This PR adds support for the /v3/connect/tokeninfo endpoint.

Usage

There are two methods that are part of the Auth resource that allow you to get information on a token; one for the ID token (idTokenInfo) and one for the access token (accessTokenInfo).

NylasClient nylas = new NylasClient.Builder("API_KEY").build();

// Get information on an ID token
Response<TokenInfoResponse> idTokenInfo = nylas.auth.idTokenInfo("idToken");

// Get information on an access token
Response<TokenInfoResponse> accessTokenInfo = nylas.auth.accessTokenInfo("accessToken");

License

I confirm that this contribution is made under the terms of the MIT license and that I have the authority necessary to make this contribution on behalf of its copyright owner.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (42cd063) 78.32% compared to head (2ab29ad) 78.53%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #205      +/-   ##
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+ Coverage     78.32%   78.53%   +0.21%     
- Complexity      196      199       +3     
============================================
  Files            29       29              
  Lines           715      722       +7     
  Branches         69       69              
============================================
+ Hits            560      567       +7     
  Misses          117      117              
  Partials         38       38              

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