Refactor Policy Enforcer Configuration

- Updated the Policy Enforcer configuration across multiple YAML files to use a unified `policyDir` instead of individual policy sources.
- Changed the step name from `enforcePolicy` to `policyEnforcer` for consistency.
- Enhanced the documentation to clarify the use of `policyUrls`, `policyDir`, and `policyFile` for policy sources.
- Adjusted related code and tests to accommodate the new configuration structure.
- Added documentation for using YAML folded scalar (>-) to keep long comma-separated policyUrls values readable across multiple lines.

config/local-beckn-one-bap.yaml

@@ -89,9 +89,7 @@ modules:
         policyEnforcer:
           id: policyenforcer
           config:
-            policySources: "./policies/compliance.rego"
-            actions: "confirm"
-            query: "data.policy.violations"
+            policyDir: "./policies"
         middleware:
           - id: reqpreprocessor
             config:
@@ -99,7 +97,7 @@ modules:
               role: bap
       steps:
         - validateSign
-        - enforcePolicy
+        - policyEnforcer
         - addRoute
         - validateSchema