Refactor Policy Enforcer to Use Unified PolicyPaths

- Updated the Policy Enforcer to consolidate policy source configuration under a single `policyPaths` key, allowing for auto-detection of URLs, directories, and files.
- Removed deprecated keys such as `policyFile` and `policyUrls` from the configuration structure.
- Adjusted related code and tests to ensure compatibility with the new configuration format.
- Enhanced documentation to clarify the usage of `policyPaths` and provide examples for various configurations.

pkg/plugin/implementation/policyenforcer/enforcer.go

@@ -24,7 +24,7 @@ func New(cfg map[string]string) (*PolicyEnforcer, error) {
 		return nil, fmt.Errorf("policyenforcer: config error: %w", err)
 	}
 
-	evaluator, err := NewEvaluator(config.PolicyPaths, config.PolicyFile, config.PolicyUrls, config.Query, config.RuntimeConfig)
+	evaluator, err := NewEvaluator(config.PolicyPaths, config.Query, config.RuntimeConfig)
 	if err != nil {
 		return nil, fmt.Errorf("policyenforcer: failed to initialize OPA evaluator: %w", err)
 	}