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/simulations/internal-only/scenario.json

@@ -0,0 +1,23 @@
+{
+  "name": "internal-only",
+  "policyPath": "docs/examples/policies/internal-only.yaml",
+  "findings": [
+    {
+      "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"
+    }
+  ],
+  "expectedDiffs": [
+    { "findingId": "library:pkg/internal-app@2.0.0", "status": "RequiresVex" },
+    { "findingId": "library:pkg/kev-component@3.1.4", "status": "RequiresVex" }
+  ]
+}