Add flow detection to Rachio hose timer

[brg468]

Proposed change

Rewrite binary sensor to use entity descriptions and add flow detected binary sensor to the hose timer.

Using a problem sensor for flow not detected. The reason I didn't choose moisture sensor was I didn't want the state of the sensor to change every time the valve turns on if flow is detected (normal condition), which would make it harder to use as a trigger IMO. Open to suggestions on other ways to handle it though.

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[brg468]

Thanks @joostlek!

[bdraco]

I pushed some readability improvements. If it works for you, its good to merge from my perspective

[brg468]

Looks good to me. Thanks @bdraco and @joostlek!