Added integration tests for auth and patient service

Implemented route for auth-service api docs

Implemented jwt validation filter on api-gateway

Added route for auth service in api gateway

Implemented login and validate token for auth service

Implemented User entity and login dtos for auth-service

Implemented api-gateway service

Implemented Kafka Consumer and analytics-service

Implemented Kafka Producer in patient service

Implemented Grpc client in patient service

Dockerized billing service

Implemented a sample billing service with grpc server

Dockerized postgres db and patient-service

Implemented delete patient workflow in patient service

Implemented update patient workflow with custom exception handling