[w3c/webpayments-methods-card] Add Security Considerations and Privacy Considerations sections (#6)

This is a recommendation from the Security and Privacy Checklist review. See https://docs.google.com/document/d/1w7ginyzNg-xZUmITK4vzcGUKB4gbMOAvlkWWaRtX14k/edit?usp=sharing for additional detail

This checklist analysis has indicated a number of privacy and security issues that pertain to the Basic Card Payment spec, and they should be incorporated into the document.


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https://github.com/w3c/webpayments-methods-card/issues/6