[play] ability to interrupt and kill kernels

[rgbkrk]

Since play is fairly barebones (and wow do I love simple UIs), we'll probably want to design a simple way to handle this for play. Beyond the design though, the epics / logic behind these can be done independent of the UI itself.

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ref: #2236

Maintainers: feel free to edit/update the description here.

/cc @mpacer @theengineear

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue hasn't had any activity on it in the last 90 days. Unfortunately we don't get around to dealing with every issue that is opened. Instead of leaving issues open we're seeking to be transparent by closing issues that aren't being prioritized. If no other activity happens on this issue in one week, it will be closed.
It's more than likely that just by me posting about this, the maintainers will take a closer look at these long forgotten issues to help evaluate what to do next.
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