Expose a new `POST /api/bulk_users` API to create many users at once

This API will accept a vector of JSON entries containing the GitHub login,
the email address and the invite count. If that user already exist, the
invite count will be updated to the new one.
fe1a861bf3Antonio Scandurra committed on 6/13/2022, 1:18:18 PMparentb1e8e81
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