feat: add basic support for Definitions

[hakandilek]

This PR is addressing #697 and adding the bom.definitions support.

I've intentionally left the bom.definitions.standards.signature out since the entire data structure elsewhere is also missing.

bom.definitions.standards.requirements and
bom.definitions.standards.levels are also left out and will be included with a latter PR #713

fixes #697
is part of #696

[hakandilek]

@jkowalleck Thanks for having the preliminary look into it.

I've rebased the PR with the recent changes. Please let me know if anything is missing or should be changed.

[jkowalleck]

@hakandilek ,
Could you add new or enhance existing test case to the model in https://github.com/CycloneDX/cyclonedx-python-lib/blob/main/tests/_data/models.py?

When creating new models:

• add a new function called get_bom_<yout-purpose-here> -- any function that starts with get_bom_ will do.
• the function must return a Bom, use the _make_bom() wrapper at best.
• In case your model does not have properly defined dependencies, add the function to the all_get_bom_funct_with_incomplete_deps.

Any function that starts with get_bom_ will be picked up, and results will be used as a test fixtures.

After that, please (re)generate the test snapshots as described here: https://github.com/CycloneDX/cyclonedx-python-lib/blob/main/tests/_data/snapshots/README.md

[hakandilek]

@jkowalleck Thanks for the feedback. I'll look into the extended test cases and let you know here.

[jkowalleck]

@hakandilek ,

could you rebase onto latest main branch?
seams like there are conflicts in the tests/_data/models.py

[hakandilek]

@hakandilek ,

could you rebase onto latest main branch? seams like there are conflicts in the tests/_data/models.py

done right now.

[jkowalleck]

some things should be changed: https://github.com/CycloneDX/cyclonedx-python-lib/pull/701/files#conversations-menu

[hakandilek]

some things should be changed: https://github.com/CycloneDX/cyclonedx-python-lib/pull/701/files#conversations-menu

Alright, updated those as well.

[jkowalleck]

@madpah , could you review these changes?

[jkowalleck]

released via https://github.com/CycloneDX/cyclonedx-python-lib/releases/tag/v8.3.0