Replace gson with Android's org.json.*

[bb441db]

Changes

Please describe both what is changing and why this is important. Include:

• Claim.asArray() now returns JSONArray or null
• Claim.asObject() now returns JSONObject or null
• Documentation for public API's has not been updated (yet)
• Replaced the GSON dependency with Android's org.json.*

References

Please include relevant links supporting this change such as a:

• https://developer.android.com/reference/org/json/package-summary
• Include proguard consumer directives for R8 compatibility #72
• Feature request: without gson #24

Testing

Please describe how this can be tested by reviewers. Be specific about anything not tested and reasons why. If this library has unit and/or integration testing, tests should be added for new functionality and existing tests should complete without errors.

[ ] This change adds test coverage

[ ] This change has been tested on the latest version of the platform/language or why not

Checklist

[ ] I have read the Auth0 general contribution guidelines

[ ] I have read the Auth0 Code of Conduct

[ ] All existing and new tests complete without errors

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Is this something you are willing to merge, if no, the PR can be closed.

If yes, I will continue with the checklist above and look into fixing some of the tests that are currently commented out and/or failing

[poovamraj]

@bb441db this PR is having a lot of breaking changes that we cannot merge directly. This will affect a lot of existing users. I understand the pains caused by GSON and proguard. We will definitely consider this in our future release. But at this point we cannot accept this PR and we will close this.