Show exception cause during logging filter initialization

[mabartos]

Description

When there is some exception thrown during the logging Filter initialization, the exception cause is not properly propagated, and users do not know what exactly happened.

It'd be great to see what nested exception caused the failure of the initialization.

ERROR: Failed to start server in (development) mode
Error details:
java.lang.RuntimeException: Unable to create instance of Logging Filter 'org.keycloak.quarkus.runtime.configuration.filters.SyslogLogLevelFilter'
        at io.quarkus.runtime.logging.LoggingSetupRecorder$4.accept(LoggingSetupRecorder.java:272)
        at io.quarkus.runtime.logging.LoggingSetupRecorder$4.accept(LoggingSetupRecorder.java:266)
        at java.base/java.util.HashMap.forEach(HashMap.java:1429)
        at io.quarkus.runtime.logging.LoggingSetupRecorder.createNamedFilters(LoggingSetupRecorder.java:266)
        at io.quarkus.runtime.logging.LoggingSetupRecorder.initializeLogging(LoggingSetupRecorder.java:141)
        at io.quarkus.deployment.steps.LoggingResourceProcessor$setupLoggingRuntimeInit2024815463.deploy_0(Unknown Source)
        at io.quarkus.deployment.steps.LoggingResourceProcessor$setupLoggingRuntimeInit2024815463.deploy(Unknown Source)
        at io.quarkus.runner.ApplicationImpl.doStart(Unknown Source)
        at io.quarkus.runtime.Application.start(Application.java:101)
        at io.quarkus.runtime.ApplicationLifecycleManager.run(ApplicationLifecycleManager.java:119)
        at io.quarkus.runtime.Quarkus.run(Quarkus.java:71)
        at org.keycloak.quarkus.runtime.KeycloakMain.start(KeycloakMain.java:141)
        at org.keycloak.quarkus.runtime.cli.command.AbstractStartCommand.run(AbstractStartCommand.java:42)
        at picocli.CommandLine.executeUserObject(CommandLine.java:2030)
        at picocli.CommandLine.access$1500(CommandLine.java:148)
        at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2465)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2457)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2419)
        at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2277)
        at picocli.CommandLine$RunLast.execute(CommandLine.java:2421)
        at picocli.CommandLine.execute(CommandLine.java:2174)
        at org.keycloak.quarkus.runtime.cli.Picocli.parseAndRun(Picocli.java:138)
        at org.keycloak.quarkus.runtime.KeycloakMain.main(KeycloakMain.java:101)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        at java.base/java.lang.reflect.Method.invoke(Method.java:580)
        at io.quarkus.bootstrap.runner.QuarkusEntryPoint.doRun(QuarkusEntryPoint.java:62)
        at io.quarkus.bootstrap.runner.QuarkusEntryPoint.main(QuarkusEntryPoint.java:33)
Exception in thread "Shutdown thread" java.lang.NullPointerException: Cannot invoke "io.quarkus.runtime.Application.isStarted()" because "app" is null
        at io.quarkus.runtime.ApplicationLifecycleManager$ShutdownHookThread.run(ApplicationLifecycleManager.java:455)