Fix -- Read the payload written by withPayload #725

[marktech0813]

I added two convenience methods to expose decoded JSON without changing existing behavior. Now you can access both decoded header and payload directly from any DecodedJWT.

You can now use:

• Decoded payload JSON: decoded.getPayloadJson()
• Decoded header JSON: decoded.getHeaderJson()

Changes

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• All existing and new tests complete without errors
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