Make it possible to extract measurements from an attested certificate without verifying#10
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During an attested-TLS session there are some cases where we would want to know the measurements from the attestation after the attestation has been verified during the initial handshake.
For example, the Buildernet workflow includes measurements from the session in HTTP request and response headers, so that the HTTP client / server has a further opportunity to verify them.
This PR makes it possible to extract the measurements from a certificate without fully verifying it (since the verification should have already taken place.
It does this by publicly exposing the method to extract the attestation from the certificate, and adding a method to get measurements from an attestation without verifying, for both Azure vTPM and DCAP.