Read Token: Remove Exceptions

[iNinja]

Read Token: Remove Exceptions

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Description

• Implemented new version of ReadToken removing TokenValidationParameters, dropping the TokenReader delegate, and returning a TokenReadingResult that wraps provides ExceptionDetails without throwing, and saves its logs as MessageDetails.
  Actual creation of the JsonWebToken untouched at this point. Exceptions that are thrown as part of the token creation are wrapped and returned as part of the result.
• Added nullability annotations on new code.
• Added tests.