Move utility classes and functions to separate sub-package

beekeepy/beekeepy/_utilities/__init__.py

beekeepy/beekeepy/_utilities/build_json_rpc_call.py

beekeepy/beekeepy/_utilities/context.py

beekeepy/beekeepy/_utilities/context_settings_updater.py

beekeepy/beekeepy/_utilities/delay_guard.py

beekeepy/beekeepy/_utilities/error_logger.py

beekeepy/beekeepy/_utilities/key_pair.py

beekeepy/beekeepy/_utilities/sanitize.py

beekeepy/beekeepy/_utilities/settings_holder.py

beekeepy/beekeepy/_utilities/state_invalidator.py

beekeepy/beekeepy/_utilities/stopwatch.py

beekeepy/beekeepy/_utilities/suppress_api_not_found.py