Add Cover to the Insteon component (#16215)

* Create cover platform

* Create insteon cover platform

* Bump insteonplm to 0.13.0

* Change async_add_devices to async_add_entities

* Missing doc string

* Simplify open and set_position

* Flake8

* Bump insteonplm to 0.13.1

* Code review changes

* Flake8 updates