feat(api): add Intel DCAP API client module

Introduced a new `intel-dcap-api` crate for interacting with Intel's DCAP APIs.
- Implemented various API client functionalities for SGX/TDX attestation services.
- Added support for registration, certification, enclave identity, and FMSPC retrieval.

Signed-off-by: Harald Hoyer <harald@matterlabs.dev>

crates/intel-dcap-api/src/lib.rs

@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright (c) 2025 Matter Labs
+
+//! Intel API Client
+//!
+//! This module provides an API client for interacting with the Intel API for Trusted Services.
+//! The API follows the documentation found at [Intel API Documentation](https://api.portal.trustedservices.intel.com/content/documentation.html).
+//!
+//! Create an [`ApiClient`] to interface with the Intel API.
+//!
+//! Example
+//! ```rust,no_run
+//! use intel_dcap_api::{ApiClient, IntelApiError, TcbInfoResponse};
+//!
+//! #[tokio::main]
+//! async fn main() -> Result<(), IntelApiError> {
+//!    let client = ApiClient::new()?;
+//!
+//!    // Example: Get SGX TCB Info
+//!    let fmspc_example = "00606A000000"; // Example FMSPC from docs
+//!    match client.get_sgx_tcb_info(fmspc_example, None, None).await {
+//!        Ok(TcbInfoResponse {
+//!               tcb_info_json,
+//!               issuer_chain,
+//!           }) => println!(
+//!            "SGX TCB Info for {}:\n{}\nIssuer Chain: {}",
+//!           fmspc_example, tcb_info_json, issuer_chain
+//!        ),
+//!        Err(e) => eprintln!("Error getting SGX TCB info: {}", e),
+//!    }
+//!
+//!    Ok(())
+//! }
+//! ```
+
+#![deny(missing_docs)]
+#![deny(clippy::all)]
+
+mod client;
+mod error;
+mod requests;
+mod responses;
+mod types;
+
+// Re-export public items
+pub use client::ApiClient;
+pub use error::IntelApiError;
+pub use responses::{
+    AddPackageResponse, EnclaveIdentityJson, EnclaveIdentityResponse, FmspcJsonResponse,
+    PckCertificateResponse, PckCertificatesResponse, PckCrlResponse, TcbEvaluationDataNumbersJson,
+    TcbEvaluationDataNumbersResponse, TcbInfoJson, TcbInfoResponse,
+};
+pub use types::{ApiVersion, CaType, CrlEncoding, PlatformFilter, UpdateType};