Step joint notch feature

[papachap]

• Implementation of the StepJointNotch based on the example for the JackRafterCut.

This is still a work in progress. The purpose of the pull request is to get an overall feedback on some of the decisions that I took and how parts of the code could be further optimized.

Also when possible, I would like to ask for some guidance on how to properly run tests of the code.

What type of change is this?

• Bug fix in a backwards-compatible manner.
• New feature in a backwards-compatible manner.
• Breaking change: bug fix or new feature that involve incompatible API changes.
• Other (e.g. doc update, configuration, etc)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• I added a line to the CHANGELOG.md file in the Unreleased section under the most fitting heading (e.g. Added, Changed, Removed).
• I ran all tests on my computer and it's all green (i.e. invoke test).
• I ran lint on my computer and there are no errors (i.e. invoke lint).
• I added new functions/classes and made them available on a second-level import, e.g. compas_timber.datastructures.Beam.
• I have added tests that prove my fix is effective or that my feature works.
• I have added necessary documentation (if appropriate)

[chenkasirer]

oops, forgot to submit.

[chenkasirer]

@papachap would you say this is ready for review/merge?

[papachap]

@papachap would you say this is ready for review/merge?

@chenkasirer I think you can now go for it!