add 'create' github webhook event to hooks.dart

[XilaiZhang]

The create webhook event and its payloads are described here at : https://docs.github.com/en/developers/webhooks-and-events/webhooks/webhook-events-and-payloads#create

The tests seem to fail pretty significantly but I looked around and they seem unrelated to this change, but are failing because of existing codes?

[XilaiZhang]

seems like I can't add reviewers. cc @CaseyHillers and @keyonghan

[CaseyHillers]

This requires an update to the changelog and increase the Y version

[CaseyHillers]

Can you add a test?

[XilaiZhang]

sure, added

[CaseyHillers]

You'll need to update CHANGELOG and the pubspec.yaml for the y version

[robrbecker]

@CaseyHillers Actually, I've set up auto-release on PR merge, so updating the changelog and version in the pubspec happens automatically after merge based on the semver label. So the PR itself should not update those files.

[CaseyHillers]

@CaseyHillers Actually, I've set up auto-release on PR merge, so updating the changelog and version in the pubspec happens automatically after merge based on the semver label. So the PR itself should not update those files.

That is fancier than I imagined since we last talked about it :-) Nice work!

@XilaiZhang feel free to disregard my comment. However, there's some formatting issues

[robrbecker]

@XilaiZhang it does look like the test file you added needs to be formatted. Use dart format --fix .

[XilaiZhang]

Thanks for the instructions! (Also thanks for providing the format commands, previously I used the same format command for flutter/cocoon and formatted like 132 files :) and reverted