api: add JSON-RPC API to get ICE servers

Currently with a hardcoded TURN server
so it can be used in the UIs.

deltachat-rpc-client/src/deltachat_rpc_client/account.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import json
 from dataclasses import dataclass
 from typing import TYPE_CHECKING, Optional, Union
 from warnings import warn
@@ -470,3 +471,8 @@ class Account:
     def initiate_autocrypt_key_transfer(self) -> None:
         """Send Autocrypt Setup Message."""
         return self._rpc.initiate_autocrypt_key_transfer(self.id)
+
+    def ice_servers(self) -> list:
+        """Return ICE servers for WebRTC configuration."""
+        ice_servers_json = self._rpc.ice_servers(self.id)
+        return json.loads(ice_servers_json)

deltachat-rpc-client/tests/test_calls.py

@@ -66,3 +66,10 @@ a=extmap:1 urn:ietf:params:rtp-hdrext:sdes:mid\r
     incoming_call_event = bob.wait_for_event(EventType.INCOMING_CALL)
     assert incoming_call_event.place_call_info == place_call_info
     assert incoming_call_event.has_video
+
+
+def test_ice_servers(acfactory) -> None:
+    alice = acfactory.get_online_account()
+
+    ice_servers = alice.ice_servers()
+    assert len(ice_servers) == 1