Improve handling of Public API files when creating new projects

[aaronpowell]

We have to add two files when you create a new integration, a PublicAPI.shipped.txt and PublicAPI.unshipped.txt. These don't get created using the template and as a result, you end up with a build error initially.

There needs to be a better workflow around this on creating a new project.

[aaronpowell]

@Alirexaa - first step is I'll review how the docs are related to the contributing guide

[github-actions]

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[Alirexaa]

/stale-extend