Add zeroconf discovery to Freebox (#47045)

* Add zeroconf discovery to Freebox

- remove deprecated discovery
- tried with SSDP too but the presentation URL is not the same (*.fbxos.fr for zeroconf, http://mafreebox.freebox.fr/ for SSDP)
- so config entry unique_id should be the MAC (included into SSDP, but not zeroconf, can be retrieve from `fbx.system.get_config()`)
- DHCP discovery might be added in the future too

* host and port are required on zeroconf

* cleanup in other PR

homeassistant/components/freebox/config_flow.py

@@ -105,3 +105,9 @@ class FreeboxFlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
     async def async_step_import(self, user_input=None):
         """Import a config entry."""
         return await self.async_step_user(user_input)
+
+    async def async_step_zeroconf(self, discovery_info: dict):
+        """Initialize flow from zeroconf."""
+        host = discovery_info["properties"]["api_domain"]
+        port = discovery_info["properties"]["https_port"]
+        return await self.async_step_user({CONF_HOST: host, CONF_PORT: port})