A115: Refactor generic service and generic stub

L115-core-refactor-generic-service-stub.md

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+L115: C-Core Refactor generic service and generic stub
+----
+* Author(s): ysseung
+* Approver: ctiller
+* Status: Draft
+* Implemented in: C Core
+* Last updated: 2024/04/15
+* Discussion at: https://groups.google.com/g/grpc-io/c/TBA
+
+## Abstract
+
+We will refactor `async_generic_service.h` and `generic_stub.h` to move
+callback based interfaces into separate targets. Existing files will include
+the callback based interfaces.
+
+## Background
+
+This enables services to only depend on the callback based interfaces of the
+generic stub and generic service.
+
+### Related Proposals:
+
+None.
+
+## Proposal
+
+We will move `CallbackGenericService` in `async_generic_service.h` to a new file
+`async_generic_service_callback.h` and make it a new public target
+`:generic_service_callback`. `async_generic_service.h` will include 
+`async_generic_service_callback.h` and existing dependencies will continue to
+include both.
+
+We will also move move callback based interfaces of `TemplatedGenericStub` in
+`generic_stub.h` to a new class `TemplatedGenericStubCallback` in
+`generic_stub_callback.h` and make it a new public target
+`:generic_stub_callback`. `CallbackGenericService` will inherit
+`CallbackGenericServiceCallback` and existing dependencies will continue to
+include both.
+
+## Implementation
+
+TBA