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Move blocking handleMessageEvent to executer thread to keep pipeline reactive #158

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Hi! 👋
Apparently channelRead in BridgeRuntime is blocking the main thread (as detected by blockhound):
Screen Shot 2023-07-16 at 12 42 30 AM

This PR fixes the blocking so that the pipeline remain reactive end-to-end.

import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.*;
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Minor: Do not use *

@@ -123,6 +118,7 @@
@Sharable
public class BridgeRuntime extends HttpStaticFileServerHandler {

private final ExecutorService executor = Executors.newSingleThreadExecutor();
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I think we should make this optional, and the Thread pool configuration and optional. Making it the default change the current behaviour, and we will have to bump to a major version 4.0.0

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