Add VoIP entities (#91320)

* WIP

* Add VoIP entities to enable calls

* Mark voip entities as config only

* Remove commented code

tests/components/voip/test_init.py

@@ -0,0 +1,14 @@
+"""Test VoIP init."""
+from homeassistant.core import HomeAssistant
+
+# socket_enabled,
+# unused_udp_port_factory,
+
+
+async def test_unload_entry(
+    hass: HomeAssistant,
+    config_entry,
+    setup_voip,
+) -> None:
+    """Test adding/removing VoIP."""
+    assert await hass.config_entries.async_unload(config_entry.entry_id)