[3.7] bpo-34977: Add Windows App Store package (GH-11027)

[zooba]

https://bugs.python.org/issue34977

[vstinner]

I would prefer to see the change land on master first, wait until buildbots run, and only later merge into 3.7.

By the way, I prefer "git cherry-pick -x" (from commit in master) to track that it's a backport, but that's just not a requirement :-)

[bedevere-bot]

When you're done making the requested changes, leave the comment: I have made the requested changes; please review again.

[zooba]

The backport is slightly different already, so it can't be a direct cherry-pick.

I'll wait for master, but I'm also going to ask @ned-deily to hold 3.7.2rc1 for this change, so please help that one land.

[vstinner]

The backport is slightly different already, so it can't be a direct cherry-pick.

Oh ok, I didn't notice.

[ned-deily]

Since we still have another couple of open issues and this is so close, I am holding 3.7.2rc1 for another day or so in the hopes we can get this in.

[zooba]

I have made the requested changes; please review again

[bedevere-bot]

Thanks for making the requested changes!

@vstinner: please review the changes made to this pull request.

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