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.

src/StellaOps.Cli.Tests/Plugins/CliCommandModuleLoaderTests.cs

@@ -3,6 +3,7 @@ using System.CommandLine;
 using System.IO;
 using System.Threading;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Abstractions;
 using StellaOps.Cli.Configuration;
 using StellaOps.Cli.Plugins;