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/serverless/diff.json

@@ -0,0 +1,23 @@
+{
+  "summary": {
+    "policy": "serverless",
+    "policyDigest": "sha256:simulation-serverless",
+    "changed": 2
+  },
+  "diffs": [
+    {
+      "findingId": "library:pkg/aws-lambda@1.0.0",
+      "baselineStatus": "Pass",
+      "projectedStatus": "Blocked",
+      "rule": "block_any_high",
+      "notes": "Serverless workloads block High+ severities."
+    },
+    {
+      "findingId": "image:sha256:untrusted-base",
+      "baselineStatus": "Pass",
+      "projectedStatus": "Blocked",
+      "rule": "forbid_unpinned_base",
+      "notes": "Base image must be pinned (no :latest)."
+    }
+  ]
+}