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Change epicsStopEvent to atomic flag. Add buffer. Add array attribute

Marco Filho requested to merge ICSHWI-19577 into main

EpicsEventTryWait has an overhead of 50 microsseconds per function call. We changed this to using an atomic flag that tells the driver when to start/stop. We have an improved performance of orders of magnitude.

Added a FIFO buffer to store ngem events since doCallbacksGenericPointer() is slower than the actual read from the socket.

Added array attribute with number of events in this->eventsToSend because NDPluginSchemas doesn't know clearly how to get that from the NDArray only.

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