Kiva Benchmark: Add a GitHub Action which runs the benchmark and publishes the results

[jwiggins]

I'm not sure if this is possible, but it would we nice if the action could open a PR against gh-pages which could then be reviewed by a human and merged as appropriate.

Step one is to determine the feasibility of this task.

[rahulporuri]

This is a tangential comment but instead of linking to the images in the benchmark data, I feel it'll be better if we can create and display the images in a new/separate table - that way, comparing the output across the kiva backends becomes straightforward.

[jwiggins]

I had exactly the same thought. We should definitely do that.

[jwiggins]

GitHub doesn't directly provide an action which can open new PRs, so we would need to roll it ourselves or audit one of the already available actions (and then pin to the audited commish).

I think this is currently more trouble than we have time for, but hopefully that will change.