Separate WebRelay class and provide status

The purpose of this PR is to make changes that will allow sensors to have a preselector and multiple switches (web relays). To accomplish this, it:

Provides an abstract WebRelay class
Provides a ControlByWeb based implementation of the WebRelay class
Modifies the WebRelayPreselector to use the WebRelayClass
Adds status and name method and property to Preselector and WebRelay
Modifies config to separate control from status to support the status method and reconfigurable status.
Modifies preselector control to use rf_path names in utility methods.
Modifies ControlByWebWebRelay and WebRelayPreselector to require name and base_url.
Adds docstrings and type hints
Adds changes from https://github.com/NTIA/Preselector/pull/10#issue-1335284508

NTIA / Preselector