feat: Implement DSCM Pluggable Service with InMemory Dictionary

- Added Dockerfile for building the DSCM service container.
- Created service and client modules for managing pluggable devices.
- Implemented gRPC methods for Create, Get, List, Delete, and Configure pluggables.
- Developed unit tests for all service functionalities.
- Added message creation utilities for test cases.
- Established logging and error handling mechanisms.
- Included README files for documentation.