chore: split-out vault code from teepot in teepot-vault

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

crates/teepot-vault/src/lib.rs

@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright (c) 2023-2025 Matter Labs
+
+//! Helper functions to verify Intel SGX enclaves and other TEEs.
+
+#![deny(missing_docs)]
+#![deny(clippy::all)]
+
+pub mod client;
+pub mod json;
+pub mod server;
+pub mod tdx;
+
+/// pad a byte slice to a fixed sized array
+pub fn pad<const T: usize>(input: &[u8]) -> [u8; T] {
+    let mut output = [0; T];
+    let len = input.len();
+    if len > T {
+        output.copy_from_slice(&input[..T]);
+    } else {
+        output[..len].copy_from_slice(input);
+    }
+    output
+}