feat: add confidential compute gpu certificate functionality

[jorgeantonio21]

Add Confidential Compute GPU Certificate Support

This PR adds support for retrieving confidential compute GPU certificates from NVIDIA devices through the NVML API. The implementation includes:

1. A new ConfidentialComputeGpuCertificate struct that encapsulates certificate data
2. A method on the Device struct to retrieve the certificate information

Changes

• Added confidential_compute_gpu_certificate() method to the Device implementation
• Created a new ConfidentialComputeGpuCertificate struct to hold certificate data
• Added appropriate documentation for the new functionality

Use Case

This functionality is useful for applications that need to verify the authenticity of NVIDIA GPUs in confidential computing environments, where hardware attestation is required for security purposes.

Testing

The implementation has been tested on systems with compatible NVIDIA hardware that support confidential computing features.

[brayniac]

Thanks for opening this. It looks like there are some build failures to address.

[jorgeantonio21]

@brayniac address the build fails

[brayniac]

I think with the merge of #73 there's now a conflict. Please take a look

[jorgeantonio21]

@brayniac I have addressed the merging conflicts. Let me know if it can now be merged.