wip: generate quote with pubkey in report data

[sbellem]

• needs review
• needs cleanup

The public key is written to file outside the enclave. Could this be a problem? What if the untrusted app changes that public key? Same reasoning goes for the report data as if the public key that is copied into the report data of a quote is tampered with then the public key is no longer useful to verify messages or outputs from the enclave.

Also:

• Add .c files from sgx-ra-sample
• TODO: Keep the history, using git-filter-repo
• Add example of verifying the signed data
• Make nix-related changes and additions