Insert code cell with generated code when clicking widget button

[benjaminszeghy]

Add the core function of using an extension to add a code cell with code in it

[mfisher87]

Nice! To fix the failing checks, we'll need to add a label to this PR. Check the output of the "Enforce PR label" and "build" checks and let me know if the error messages makes sense!

Let's ignore pre-commit for now, it needs to be set up.

[mfisher87]

The check links job is kind of a jerk, sometimes you just need to re-run it 😬

[mfisher87]

Since merging #3 pre-commit checks are now actually doing something! I'd suggest running prek run --all-files locally to do the autofixes. Looks like there's one error that can't be autofixed, though :)

[benjaminszeghy]

OK, all checks look good now, and It stills builds and runs as expected. Merging!

[mfisher87]

Nicely done!