Add claims parameter in error response

[kpanwar]

I noticed that only error and error_description are being bubbled up back to the developer when STS returns an error. STS can also return a "claims" value in the JSON response. We need to add support to return it back to the developer.

[danieldobalian]

Example error (currently will be HTTP 400, but may be changed to 401):

HTTP 401; Unauthorized

error=interaction_required

error_description=AADSTS50076: Due to a configuration change made by your administrator, or because you moved to a new location, you must use multi-factor authentication to access '<Web API App/Client ID>'.

claims={"access_token":{"polids":{"essential":true,"Values":["<GUID>"]}}}

[partnerinflight]

this is not needed for objc. We don't expect STS to ever return this error back to a mobile client.