nativeAsyncTimeoutMs property

Timeout in milliseconds for @nitroNativeAsync calls. When > 0, if the native side fails to post a result within this window (a crashed or buggy native impl), the returned Future completes with a TimeoutException instead of hanging forever, and the underlying ReceivePort + per-call error slot are released. Set to 0 (the default) to wait indefinitely — the native contract is to post exactly one message, so this is opt-in resilience against a misbehaving implementation.