[FEATURE] Refactor to use `cyclonedx-python-lib`

[madpah]

cyclonedx-python-lib provides a single set of models and output methods that support CycloneDX in both XML and JSON and all schema versions.

There already exists multiple Python tools that use this library including:

• cyclonedx-python
• jake

This feature will:

• Refactor the library to use cyclonedx-python-lib
• Add QA tools such as flake8 and mypy for local development and in CI
• Add documentation on readthedocs.org