Add CLI tool to extract rule information with JSON output

[Copilot]

This PR adds a new get rule command to the PSRule CLI tool that extracts rule metadata and outputs it in JSON format for pipeline automation.

What's Changed

• New CLI Command: Added ps-rule get rule command with comprehensive options
• JSON Output: Returns structured JSON perfect for CI/CD pipeline consumption
• Rule Metadata: Extracts tags, labels, annotations, severity, synopsis, description, and recommendations
• Command Options: Supports --path, --module, --name, --baseline, --include-dependencies, --no-restore
• Tests: Added unit tests to verify command functionality

Usage

# Basic usage - get all rules
ps-rule get rule

# Get specific rules with dependencies
ps-rule get rule --include-dependencies --name "Security.*" --path ./rules

# Get rules from specific modules
ps-rule get rule --module MyModule.Rules --baseline Production

JSON Output Structure

{
  "rules": [
    {
      "ruleName": "Security.TLS",
      "displayName": "Use TLS 1.2+",
      "synopsis": "Ensure TLS 1.2 or higher is used",
      "description": "TLS versions below 1.2 have known vulnerabilities",
      "recommendation": "Configure services to use TLS 1.2 or higher",
      "moduleName": "Security.Rules",
      "severity": "High",
      "tags": { "category": "Security", "type": "Protocol" },
      "annotations": { "version": "1.0.0", "author": "Security Team" },
      "labels": { "environment": "Production" }
    }
  ]
}

Benefits for Pipeline Automation

This command enables easy programmatic access to rule information for:

• Build and release automation scripts
• Copilot actions that need rule metadata
• CI/CD pipelines that process rule information
• Custom tooling that works with PSRule data

The JSON output format makes it simple to consume rule metadata in any language or tool that can parse JSON.

Fixes #2977.

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