common: add ParameterUpdater for thread-safe parameter updates #34186
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The GIL does not protect against race conditions when accessing attributes like self.is_metric across multiple threads. This PR introduces the
ParameterUpdaterclass, which periodically updates parameters in a separate thread and ensures safe access through a mutex.It also resolves a potential race condition in
selfdrivedby ensuring that parameters likeself.CP.openpilotLongitudinalControlare accessed only in the main thread.it's currently used in
selfdrivedandcard, and can be extended to other modules requiring updated parameters.