Change Enphase dry contact relay binary_sensor to switch

[cgarwood]

Proposed change

Switch the dry contact relay state entity from a binary_sensor to a switch and add support for toggling the relay open and closed.

pyenphase/pyenphase@v1.6.0...v1.8.1

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• Dependency upgrade
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• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @bdraco, @dgomes, @joostlek, mind taking a look at this pull request as it has been labeled with an integration (enphase_envoy) you are listed as a code owner for? Thanks!

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[cgarwood]

The sensor entity was only in dev so I don't think this would qualify as a breaking change

[cgarwood]

Test failure is unrelated