Implementation of GCS Core in Go

This merge request includes initial implementation of GCS Core in Go.

Changes:

• Docker Control subroutine:
• Frame Processor subroutine:
  • unmarshalls received frame into the structure,
  • sends the structure to the proper chanel,
• ZeroMQ Subscriber subroutine:
  • receives frames from ZeroMQ proxy,
  • sends received frames to Frame Processor,
• ZeroMQ Publisher subroutine:
  • initial implementation of subroutine UNTESTED,
• Watchdog subroutine:
  • used to handle interrupt signals,
• Logger subroutine:
  • used to handle all errors passed to Error Chanel,
• CI/CD:
  • created multistage build Dockerfile,
  • fixed CI/CD pipeline according to template,

TODO:

• move from docker build to docker buildx build in CI/CD pipeline, two solutions:
  1. requires turning on experimental features in docker config,
  2. wait until the feature becomes mainline,