* Update configuration schema to support multiple Pi-holes
* Construct sensors for each configured Pi-hole
* Ensure each Pi-hole has a unique name
* Update services to handle multiple Pi-holes
* Update tests for multiple configurations
* Refactor tests to support service testing
* Fix else-raise per pyliunt
* Per code review, add all entities in a single call
* Per code review, add the default name as default.
* Per code review, add cv.ensure_list to prevent breaking change
* Per code review, move name validation to schema
* Remove default name
* Per code review, validate api_key in schema definition
* Per code review, rename variables
* Per code review, use list comprehension
* Ensure unique slug names in config validation
* Per code review, refactor to CoroutineMock
* Fix adding sensor entities
* Per code review, refactor mock function creation
* Per code review, refactor mock function return values
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