core, python: fix refused renames, extend the client API (#7379)

* core: do not commit refused name changes

* feat(python): add error base and missing commands

* feat(python): let callers drive startup themselves

* style(python): satisfy the linter, skip generated types

* feat(python): expose the message of a command error

* core: update query plans

* core: fix the batch limit parse error on GHC 8.10

* feat(python): reject profile images no client can render

packages/simplex-chat-python/tests/test_native_url.py

@@ -1,6 +1,8 @@
 from unittest.mock import patch
+
 import pytest
-from simplex_chat._native import _platform_tag, _libs_url, _libname
+
+from simplex_chat._native import _libname, _libs_url, _platform_tag
 from simplex_chat._version import LIBS_VERSION