feat: add extended support for Definitions

[hakandilek]

This PR builds on top of #701 to create extended elements for the bom.definitions.standards like:

• Requirements and
• Levels

depends on: #701
is part of: #696

[hakandilek]

please rebase onto master.

Yes, rebased now.

[jkowalleck]

thank you for all your efforts, @hakandilek .

there is no release planned for the rest of the year (except bug fixes, these are released without planning).
Therefore, i will postpone the review until January 2025.

I hope this is okay for you.

[hakandilek]

i will postpone the review until January 2025.

@jkowalleck That's totally fine. Thanks for the information. I'll rebase this branch once more to keep it up to date.

[jkowalleck]

FYI: this is in review.

[jkowalleck]

I will take care of updates/merges, and the now-breaking tests.

[jkowalleck]

i am in the middle of review,
and added some sprinkles here and there.

some tests are flaky, the sometimes fail, sometimes pass.
need to investigate deeper.

PS: reason found and fixed: #713 (comment)

[hakandilek]

some tests are flaky, the somtimes fail, sometimes pass. need to investigate deeper.

Thanks for having a closer look. I've also spent no those flaky tests and was not able to locate the root-cause. Please let me know if I can add something.

[jkowalleck]

review done.
LGTM

[hakandilek]

Thanks for working on the remaining bits and pieces

[jkowalleck]

this was released via https://github.com/CycloneDX/cyclonedx-python-lib/releases/tag/v8.6.0