Add Policy DSL Validator, Schema Exporter, and Simulation Smoke tools

- Implemented PolicyDslValidator with command-line options for strict mode and JSON output.
- Created PolicySchemaExporter to generate JSON schemas for policy-related models.
- Developed PolicySimulationSmoke tool to validate policy simulations against expected outcomes.
- Added project files and necessary dependencies for each tool.
- Ensured proper error handling and usage instructions across tools.

samples/policy/internal-only/diffs.json

@@ -0,0 +1,12 @@
+[
+  {
+    "findingId": "library:pkg/internal-app@2.0.0",
+    "status": "RequiresVex",
+    "rule": "accept_vendor_vex"
+  },
+  {
+    "findingId": "library:pkg/kev-component@3.1.4",
+    "status": "RequiresVex",
+    "rule": "accept_vendor_vex"
+  }
+]

samples/policy/internal-only/findings.json

@@ -0,0 +1,15 @@
+[
+  {
+    "findingId": "library:pkg/internal-app@2.0.0",
+    "severity": "Medium",
+    "source": "GHSA",
+    "environment": "internal"
+  },
+  {
+    "findingId": "library:pkg/kev-component@3.1.4",
+    "severity": "High",
+    "source": "NVD",
+    "tags": ["kev"],
+    "environment": "internal"
+  }
+]