MAG-990: SKA SRC Clients repo Pipeline improvements

The MR contains below changes towards pipeline improvements

• Integrate static code analysis tools and testing framework black, isort, flake, pylint, pylint-junit, pytest etc
• Improve pipeline configuration, moving on towards adapting full DevOps model as per the SKA SRC requirements.
• Add lint, json-reports, build, test, publish and scan stages to the pipeline machinery
• Add ska-cicd-makefile as a sub-modules to the src clients repo for utilisation of CI-CD make targets and variables

• make python-format - To format the python code
• make python-lint - To check the linting errors and code refactoring if any in the code base
• make python-test - To execute and verify the results for the added unit tests

• Upgrade Makefile and make target usage to adapt target make python-test
• Add dummy unit test module to verify the python-test job and test reports
• Use poetry for python packaging and dependency management.
• Add pyproject.toml with dependencies
• Update docs/ folder to gather the documentation associated with the given project and upgrade to the latest SKAO readthedocs.
• Add .release include the release details and tag for projects's python-package and docker image release
• Add CHANGELOG to reflect exact changes done under targeted release tag

Note: Linting warnings of different types are observed after adding linting and formatting checks on the code, that needs to be fixed (Added the list of warnings in .pylintrc)