Create a view of Resources

[seanmonstar]

As we instrument resources (sockets, files, timers, etc) (#39), we want a view to visualize them, seeing related attributes and states, such as what task they currently "belong" to.

[seanmonstar]

I was playing with some fake data and came up with this potential mock-up:

[pnkfelix]

One important detail/goal here is that in an ideal world, a user would be able to distinguish "Task A is waiting on Resource" from "Task B currently using Resource", and that in turn from "One of tasks C or D responsible for eventually replenishing Resource." (I can imagine in the general case it may not be feasible to actually supply all that info, especially the latter in a very dynamic system. But I can dream!)

[seanmonstar]

Agreed, this will be especially useful for things like channels or locks, where we know one task is doing something that will affect another waker.

[hawkw]

I believe this was implemented in #188.