Refactor Policy Enforcer to Policy Checker

- Renamed the `PolicyEnforcer` interface and related implementations to `PolicyChecker` for clarity and consistency.
- Updated configuration keys in YAML files to reflect the new `checkPolicy` terminology.
- Adjusted related code, tests, and documentation to support the new naming convention and ensure compatibility.
- Enhanced comments and examples for the `checkPolicy` configuration to improve usability.

install/build-plugins.sh

@@ -23,7 +23,7 @@ plugins=(
     "schemav2validator"
     "signer"
     "signvalidator"
-    "policyenforcer"
+    "opapolicychecker"
 )
 
 for plugin in "${plugins[@]}"; do

install/docker-compose-adapter-beckn-one.yml

@@ -36,7 +36,6 @@ services:
     volumes:
       - ../config:/app/config
       - ../schemas:/app/schemas
-      - ../policies:/app/policies
     command: ["./server", "--config=/app/config/local-beckn-one-bap.yaml"]
 
   onix-bpp:
@@ -58,7 +57,6 @@ services:
     volumes:
       - ../config:/app/config
       - ../schemas:/app/schemas
-      - ../policies:/app/policies
     command: ["./server", "--config=/app/config/local-beckn-one-bpp.yaml"]
 
   sandbox-bap:

install/docker-compose-adapter.yml

@@ -36,7 +36,6 @@ services:
     volumes:
       - ../config:/app/config
       - ../schemas:/app/schemas
-      - ../policies:/app/policies
     command: ["./server", "--config=/app/config/local-simple.yaml"]
 
   # Vault - Key Management Service