Track fine grain updates to stores

[thetarnav]

Currently the debugSignal, debugOwnerSignals, etc. aren't trying to handle stores specially.
In effect, debugging stores is hard or impossible.

Stores are problematic is many ways for debugging:

• signals for properties are created only if the property is read, meaning that or I would have to read all of the keys to track them (which could affect the performance of the application in development, and provide an untrue insights, because this behavior of stores is by design) or possibly, not be able to correctly track the store state.
• the property signals aren't added anywhere to the graph as far as I can see. So getting to them could be a challenge without changing solid code.
• stores doesn't seem to be care about signal names, and as there is no API provided to the users to name them. Users could be stuck looking at weird, meaningless names.