Allow customizing unit for temperature and pressure sensors (#64366)
* Allow customizing unit for temperature and pressure sensors
* pylint
* Adjust google_wifi tests
* Address review comments and add tests
* Improve rounding when scaling
* Tweak rounding
* Further tweak rounding
* Allow setting entity options with config/entity_registry/update
* Address review comments
* Tweak tests
* Load custom unit when sensor is added
* Override async_internal_added_to_hass
* Adjust tests after rebase
* Apply suggestions from code review
Co-authored-by: Paulus Schoutsen <balloob@gmail.com>
* Address review comments
Co-authored-by: Paulus Schoutsen <balloob@gmail.com>
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