feat(python)!: default license to Apache-2.0 if unset

[garysassano]

Adding a default Apache-2.0 license to PythonProject to align it with NodeProject.

BREAKING CHANGE: The PythonProject now defaults to an Apache-2.0 license. To use a different license, you must specify the license property in your project configuration.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.34%. Comparing base (f41cf3c) to head (3e4f0ea).
Report is 5 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3395      +/-   ##
==========================================
+ Coverage   96.32%   96.34%   +0.02%     
==========================================
  Files         191      192       +1     
  Lines       37407    37568     +161     
  Branches     3489     3509      +20     
==========================================
+ Hits        36032    36195     +163     
+ Misses       1375     1373       -2     

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[mrgrain]

Do we really not have any tests for this? 😱

Also this looks like it will be a breaking change.

[mrgrain]

Sorry, this is going to be super weird. Because license is defined here: https://github.com/projen/projen/blob/main/src/python/python-packaging.ts#L48

We need to add a @default but then this also needs to change for all usages of PythonPackagingOptions, not just poetry.

[mrgrain]

Code looks good. Will holding this back to group with at least one other Breaking Change.

I'm also still wondering if we have a better transition path here. This feels high risk to unintentionally license a bunch of packages under Apache-2.0

[mrgrain]

@garysassano Been thinking more about this. We will at least have to add a warning about undefined license defaulting to Apache2.0. The warning can be removed with GA (make sure to add a @todo with respective comment).

[mrgrain]

We need a warning for this.