Add labels field to EntityRegistryEntry (#246)

See https://github.com/home-assistant/core/blob/902159387848e70ff93a0b99a09e3768c21bb1d3/homeassistant/helpers/entity_registry.py#L219 for the HomeAssistant model

Co-authored-by: Jan Kuechler <jan.kuechler@cern.ch>

Author: jan-kuechler

homeassistant_api/models/entity_registry.py

@@ -51,6 +51,7 @@ class EntityRegistryEntry(BaseModel):
     hidden_by: EntityHiddenBy | None = None
     icon: str | None = None
     id: str
+    labels: set[str] = Field(default_factory=set)
     modified_at: DatetimeIsoField
     name: str | None = None
     options: dict[str, Any] = Field(default_factory=dict)