Add sample proof bundle configurations and verification script

- Introduced sample proof bundle configuration files for testing, including `sample-proof-bundle-config.dsse.json`, `sample-proof-bundle.dsse.json`, and `sample-proof-bundle.json`.
- Implemented a verification script `test_verify_sample.sh` to validate proof bundles against specified schemas and catalogs.
- Updated existing proof bundle configurations with new metadata, including versioning, created timestamps, and justification details.
- Enhanced evidence entries with expiration dates and hashes for better integrity checks.
- Ensured all new configurations adhere to the defined schema for consistency and reliability in testing.

tests/Vex/ProofBundles/test_verify_sample.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/../../.." && pwd)"
+
+schema="$repo_root/docs/benchmarks/vex-evidence-playbook.schema.json"
+catalog="$repo_root/docs/benchmarks/vex-justifications.catalog.json"
+cas_root="$repo_root/tests/Vex/ProofBundles/cas"
+
+for bundle in "$repo_root"/tests/Vex/ProofBundles/*proof-bundle*.json; do
+  [[ "$bundle" == *.dsse.json ]] && continue
+  python "$repo_root/scripts/vex/verify_proof_bundle.py" \
+    --bundle "$bundle" \
+    --schema "$schema" \
+    --catalog "$catalog" \
+    --cas-root "$cas_root"
+done