Find most depended upon maintainers

[vladh]

@chadwhitacre has hypothesised, based on some research, that the overwhelming majority of widely-depended-upon Open Source software is maintained by only a few thousand Open Source maintainers.

It would be useful to identify these maintainers, even if imprecisely. For one thing, it would be great to make these maintainers' voices heard, particularly as to what kind of funding they need, and what they could achieve with more payments from the companies who depend on their work. We could create and publish maintainer profiles as part of #286.

In chadwhitacre/openpath#20, @chadwhitacre and @andrew did some work towards figuring out the most depended upon packages on package registries. We could build on this work to identify the currently most depended upon maintainers.

I had a call with @andrew today, who very kindly helped me get started with using Ecosyste.ms to do this. Particularly useful services are summary.ecosyste.ms, packages.ecosyste.ms, maintainers.ecosyste.ms and repos.ecosyste.ms.