Teaclave SGX SDK v2.0 Remote Attestation Support

[tilosp]

Does the SGX SDK v2.0 currently support Remote Attestation?
Since the examples for remote attestation are not yet ported, i was wondering if there are still some missing pieces in the sdk.

[yangfh2004]

Very few efforts were put into this project, my PR was opened for a while without any feedback. The Rust SGX SDK not only needs to support EPID remote attestation but also needs to support DCAP remote attestation. #448

Both Microsoft and Intel have rolled out their remote attestation services for DCAP quotes but there is no corresponding updates here.