Added worker pool list and detail views (#733)

As with !1772 (merged), I made assumptions about what elements should be visible and what shouldn't:

• I considered enabled, instance_wide, ephemeral, architectures, tags, limits, as publicly visible
• I considered provider_account as not visible, except for data["provider_type"]

Everything is currently visible also to anonynous users. I feel that's too much and some kind of restriction should be in place, but I don't know where to draw the line