Allow setting an entity's name by its device class (#90767)

Co-authored-by: Franck Nijhof <git@frenck.dev>

homeassistant/helpers/template_entity.py

@@ -172,6 +172,8 @@ class _TemplateAttribute:
 class TemplateEntity(Entity):
     """Entity that uses templates to calculate attributes."""
 
+    _attr_name: str | None
+
     _attr_available = True
     _attr_entity_picture = None
     _attr_icon = None