Add event_producer · exponentially/extreme@3c9793a

test subscriber can stop delivering of new events in processing response (Extreme.EventProducerTest)

test for recreated stream is ok (Extreme.EventProducerTest)

test events written just after subscription starts are also pushed to client in correct order (Extreme.EventProducerTest)

test events written while subscribing are also pushed to client in correct order (Extreme.EventProducerTest)

test for soft deleted stream is ok (Extreme.EventProducerTest)

test for non existing stream is ok (Extreme.EventProducerTest)

test for existing stream (Extreme.EventProducerTest)

test Benchmark writing 1_000 events at once (ExtremeBenchmarkTest)

test Benchmark reading and writing simultaneously is ok (ExtremeBenchmarkTest)

test Benchmark writing 10 events 100 times (ExtremeBenchmarkTest)

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