Integrate ITA client

The Intel Trust Authority (ITA) is a service for verifying the authenticity of an Intel TDX platform. By integrating a small ITA client, this library will expose APIs to validate the authenticity of their platforms alongside other integrity properties.

The issue does not name files, tests, or entry points. Start by locating the library's existing platform-attestation APIs and how integrity properties are exposed, then determine the ITA client's required integration boundary. Done means the library exposes an API that validates Intel TDX platform authenticity through ITA alongside the existing integrity properties.

Written by the indexing model from the issue text.