remove examples gateway. (opea-project#979)

* remove examples gateway.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* remove gateway.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* refine service code.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Update http_service.py

* remove gateway ut.

* remove gateway ut.

* fix conflict service name.

* Update http_service.py

* add handle message ut.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* remove `multiprocessing.Process` start server code.

* fix ut.

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* remove multiprocessing and enhance ut for coverage.

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: chen, suyue <[email protected]>

README.md

@@ -125,20 +125,6 @@ class ExampleService:
         self.megaservice.flow_to(embedding, llm)
 ```
 
-## Gateway
-
-The `Gateway` serves as the interface for users to access the `Megaservice`, providing customized access based on user requirements. It acts as the entry point for incoming requests, routing them to the appropriate `Microservices` within the `Megaservice` architecture.
-
-`Gateways` support API definition, API versioning, rate limiting, and request transformation, allowing for fine-grained control over how users interact with the underlying `Microservices`. By abstracting the complexity of the underlying infrastructure, `Gateways` provide a seamless and user-friendly experience for interacting with the `Megaservice`.
-
-For example, the `Gateway` for `ChatQnA` can be built like this:
-
-```python
-from comps import ChatQnAGateway
-
-self.gateway = ChatQnAGateway(megaservice=self.megaservice, host="0.0.0.0", port=self.port)
-```
-
 ## Contributing to OPEA
 
 Welcome to the OPEA open-source community! We are thrilled to have you here and excited about the potential contributions you can bring to the OPEA platform. Whether you are fixing bugs, adding new GenAI components, improving documentation, or sharing your unique use cases, your contributions are invaluable.

comps/__init__.py

@@ -47,23 +47,6 @@
 from comps.cores.mega.orchestrator import ServiceOrchestrator
 from comps.cores.mega.orchestrator_with_yaml import ServiceOrchestratorWithYaml
 from comps.cores.mega.micro_service import MicroService, register_microservice, opea_microservices
-from comps.cores.mega.gateway import (
-    Gateway,
-    ChatQnAGateway,
-    CodeGenGateway,
-    CodeTransGateway,
-    DocSumGateway,
-    TranslationGateway,
-    SearchQnAGateway,
-    AudioQnAGateway,
-    RetrievalToolGateway,
-    FaqGenGateway,
-    VideoQnAGateway,
-    VisualQnAGateway,
-    MultimodalQnAGateway,
-    GraphragGateway,
-    AvatarChatbotGateway,
-)
 
 # Telemetry
 from comps.cores.telemetry.opea_telemetry import opea_telemetry