Display resources and task annotations in the dashboard

[ian-r-rose]

This feature request is borne from two observations:

1. Users frequently have a difficult time setting up clusters with abstract "resources", and often don't know if they did it correctly.
2. Users often find working with task annotations challenging. This is made especially difficult because annotations can be unexpectedly lost (Graph optimization loses annotations dask#7036) or fused (Fuse compatible annotations dask#9402) during graph optimization, and dask offers very little visibility into the optimized graph.

I think both of these could be improved by including both resources and task annotations in the dask dashboard. It would probably be easiest to do this in the static jinja templates, though there may be useful places to populate this info in the more dynamic bokeh dashboards as well.