NUMA "minimap" in dashboard

[Kobzol]

Sometimes it's quite important to know on which NUMA nodes and sockets was some task running. We should have this data available in the log (individual cores of a task + core layout of its worker), so it should be possible to display in the dashboard.

We could show a rectangular grid of cores divided into NUMA sockets, and draw some of the squares with a different color, based on the fact if a task core was allocated on it, or if it was allocated + pinned (if it wasn't pinned, then we basically don't know if the task actually executed on that core). This could be shown in the task detail screen.