Add blebox binary_sensor platform (#79535)

* Add binary_sensor platform, with test.

* Applied suggestions by @epenet

* refactor: as @epenet suggested, passing entity_description to init

* Update homeassistant/components/blebox/binary_sensor.py

@epenet suggestion, moved refactored logic of create_blebox_entities into BleBoxBinarySensorEntity init

Co-authored-by: epenet <6771947+epenet@users.noreply.github.com>

* refactor: as @epenet class selector and entity creation moved to binary_sensor

* refactor: list comprehension in entity list setup in binary sensor

* Update homeassistant/components/blebox/binary_sensor.py

Co-authored-by: epenet <6771947+epenet@users.noreply.github.com>

Co-authored-by: epenet <6771947+epenet@users.noreply.github.com>

homeassistant/components/blebox/binary_sensor.py

@@ -0,0 +1,55 @@
+"""BleBox binary sensor entities."""
+
+from blebox_uniapi.binary_sensor import BinarySensor as BinarySensorFeature
+from blebox_uniapi.box import Box
+
+from homeassistant.components.binary_sensor import (
+    BinarySensorDeviceClass,
+    BinarySensorEntity,
+    BinarySensorEntityDescription,
+)
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+
+from . import DOMAIN, PRODUCT, BleBoxEntity
+
+BINARY_SENSOR_TYPES = (
+    BinarySensorEntityDescription(
+        key="moisture",
+        device_class=BinarySensorDeviceClass.MOISTURE,
+    ),
+)
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    config_entry: ConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    """Set up a BleBox entry."""
+
+    product: Box = hass.data[DOMAIN][config_entry.entry_id][PRODUCT]
+    entities = [
+        BleBoxBinarySensorEntity(feature, description)
+        for feature in product.features.get("binary_sensors", [])
+        for description in BINARY_SENSOR_TYPES
+        if description.key == feature.device_class
+    ]
+    async_add_entities(entities, True)
+
+
+class BleBoxBinarySensorEntity(BleBoxEntity[BinarySensorFeature], BinarySensorEntity):
+    """Representation of a BleBox binary sensor feature."""
+
+    def __init__(
+        self, feature: BinarySensorFeature, description: BinarySensorEntityDescription
+    ) -> None:
+        """Initialize a BleBox binary sensor feature."""
+        super().__init__(feature)
+        self.entity_description = description
+
+    @property
+    def is_on(self) -> bool:
+        """Return the state."""
+        return self._feature.state