Add code to pull Magento employees from the Magento org's all-employees team

[filmaj]

This would require using a github access token that has privileges to the magento github org (like my personal access token), so probably want to put this behind a flag for the tool.

But this would be a much more accurate way of identifying Magento employees instead of using regex on the Company field of GitHub.com user profiles / pounding the REST API. Would be much faster too.

When tackling this, should also see how the Adobe IT DB of employee github.com usernames is coming along, and if it's grown to include some decent % of Adobe engineering numbers, maybe we can use that instead too.