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/requests.rs

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright (c) 2025 Matter Labs
+
+use serde::Serialize;
+
+#[derive(Serialize)]
+pub(crate) struct PckCertRequest<'a> {
+    #[serde(rename = "platformManifest")]
+    pub(crate) platform_manifest: &'a str,
+    pub(crate) cpusvn: &'a str,
+    pub(crate) pcesvn: &'a str,
+    pub(crate) pceid: &'a str,
+}
+
+#[derive(Serialize)]
+pub(crate) struct PckCertsRequest<'a> {
+    #[serde(rename = "platformManifest")]
+    pub(crate) platform_manifest: &'a str,
+    pub(crate) pceid: &'a str,
+}
+
+#[derive(Serialize)]
+pub(crate) struct PckCertsConfigRequest<'a> {
+    #[serde(rename = "platformManifest")]
+    pub(crate) platform_manifest: &'a str,
+    pub(crate) cpusvn: &'a str,
+    pub(crate) pceid: &'a str,
+}