feat: add attestation report fetch functionality to device

[jorgeantonio21]

Add Confidential Computing GPU Certificate and Attestation Report Support

This PR adds support for two NVML confidential computing functions:

1. nvmlDeviceGetConfComputeGpuCertificate - Retrieves the GPU certificate for confidential computing
2. nvmlDeviceGetConfComputeGpuAttestationReport - Fetches the attestation report for confidential computing

Implementation Details

• Added ConfidentialComputeGpuCertificate struct to represent the certificate data
• Added ConfidentialComputeGpuAttestationReport struct to represent the attestation report
• Implemented corresponding methods on the Device struct to access these features
• Added proper documentation with error conditions and usage information
• Imported necessary constants from the FFI bindings

Use Cases

These additions enable applications to:

• Verify the authenticity of NVIDIA GPUs in confidential computing environments
• Generate attestation reports that can be used in remote attestation workflows
• Support secure GPU workloads in confidential computing scenarios

[brayniac]

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

[jorgeantonio21]

@brayniac address the build fail