Adds state artifact fetcher

[Mehul-Kumar-27]

• PART OF The satellite should be able to fetch the OCI state and process it.  #49

Summary by CodeRabbit

Release Notes

• New Features

  • Introduced new environment variables for enhanced configuration: GROUP_NAME and STATE_ARTIFACT_NAME.
  • Added a new configuration file (config.json) for authentication and registry management.
  • Implemented a scheduled process for fetching and replicating state artifacts, improving state management.
  • Enhanced capabilities for managing state artifacts with new methods in the StateReader interface.

• Bug Fixes

  • Enhanced error handling and logging during server shutdown and state fetching processes.

• Refactor

  • Streamlined configuration loading and management, including updates to the Config struct.
  • Removed deprecated methods and restructured several components to focus on new functionalities.
  • Reorganized utility functions to simplify handling of registry-related strings and durations.

• Documentation

  • Updated comments and logging messages to reflect recent changes and improvements in functionality.