[Task]: Debug guide for Python Policy Executor

[renuka-fernando]

Please select the area the issue is related to

Area/Gateway (Routing, API deployment in gateway etc.)

Please select the aspect the issue is related to

Aspect/API (API backends, definitions, contracts, interfaces, OpenAPI)

Description

Same as https://github.com/wso2/api-platform/blob/main/gateway/DEBUG_GUIDE.md for Python Policy Excutor