docs/packaging: Create a section on using github-cli to make a pull request

[EbonJaeger]

Description

Adds a section to the "Submitting a pull request" article about using github-cli to make it.

This uses a tab group so the reader can switch between versions for creating a PR.

[ermo]

I like this.

Just needs to have repo -> repository per style guide?

[EbonJaeger]

I think I'd rather do all the repo -> repository migrations in a separate PR. There are more than just these two, and I think it's better to have them in the same change scope instead of tacked on to another one.

[GZGavinZhao]

Looks good to me on the gh part! Just a small potential addition. It up to you whether to include it or not.