[GR-52790] Print stack trace of UserException causes.

[graalvmbot]

In case a UserException has a cause attached, print its stack trace right after all messages to provide users with more diagnostic info.

An example where this is useful is a failing Feature. Currently, the output would look like this:

Error: Feature defined by org.springframework.aot.graalvm.ConstantFieldFeature unexpectedly failed with a(n) java.lang.NoSuchMethodError. Please report this problem to the authors of org.springframework.aot.graalvm.ConstantFieldFeature.
com.oracle.svm.driver.NativeImage$NativeImageError
	at org.graalvm.nativeimage.driver/com.oracle.svm.driver.NativeImage.showError(NativeImage.java:2298)
	at org.graalvm.nativeimage.driver/com.oracle.svm.driver.NativeImage.build(NativeImage.java:1886)
	at org.graalvm.nativeimage.driver/com.oracle.svm.driver.NativeImage.performBuild(NativeImage.java:1845)

This PR makes the stack trace of the exception thrown in the feature available to the user:

Error: Feature defined by org.springframework.aot.graalvm.ConstantFieldFeature unexpectedly failed with a(n) java.lang.NoSuchMethodError. Please report this problem to the authors of org.springframework.aot.graalvm.ConstantFieldFeature.
Caused by: java.lang.NoSuchMethodError: 'org.graalvm.compiler.debug.DebugContext com.oracle.svm.hosted.FeatureImpl$DuringSetupAccessImpl.getDebugContext()'
        at org.springframework.aot.graalvm.ConstantFieldFeature.duringSetup(ConstantFieldFeature.java:41)
        at org.springframework.aot.graalvm.ConstantFieldFeature.duringSetup(ConstantFieldFeature.java:37)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGenerator.lambda$setupNativeImage$17(NativeImageGenerator.java:1042)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.FeatureHandler.forEachFeature(FeatureHandler.java:93)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGenerator.setupNativeImage(NativeImageGenerator.java:1042)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGenerator.doRun(NativeImageGenerator.java:590)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGenerator.run(NativeImageGenerator.java:554)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGeneratorRunner.buildImage(NativeImageGeneratorRunner.java:528)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGeneratorRunner.build(NativeImageGeneratorRunner.java:711)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGeneratorRunner.start(NativeImageGeneratorRunner.java:139)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGeneratorRunner.main(NativeImageGeneratorRunner.java:94)
Internal exception: com.oracle.svm.core.util.UserError$UserException: Feature defined by org.springframework.aot.graalvm.ConstantFieldFeature unexpectedly failed with a(n) java.lang.NoSuchMethodError. Please report this problem to the authors of org.springframework.aot.graalvm.ConstantFieldFeature.
        at org.graalvm.nativeimage.builder/com.oracle.svm.core.util.UserError.abort(UserError.java:97)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.FeatureHandler.handleFeatureError(FeatureHandler.java:299)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.FeatureHandler.forEachFeature(FeatureHandler.java:95)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGenerator.setupNativeImage(NativeImageGenerator.java:1042)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGenerator.doRun(NativeImageGenerator.java:590)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGenerator.run(NativeImageGenerator.java:554)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGeneratorRunner.buildImage(NativeImageGeneratorRunner.java:528)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGeneratorRunner.build(NativeImageGeneratorRunner.java:711)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGeneratorRunner.start(NativeImageGeneratorRunner.java:139)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGeneratorRunner.main(NativeImageGeneratorRunner.java:94)
Caused by: java.lang.NoSuchMethodError: 'org.graalvm.compiler.debug.DebugContext com.oracle.svm.hosted.FeatureImpl$DuringSetupAccessImpl.getDebugContext()'
        at org.springframework.aot.graalvm.ConstantFieldFeature.duringSetup(ConstantFieldFeature.java:41)
        at org.springframework.aot.graalvm.ConstantFieldFeature.duringSetup(ConstantFieldFeature.java:37)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGenerator.lambda$setupNativeImage$17(NativeImageGenerator.java:1042)
        at org.graalvm.nativeimage.builder/com.oracle.svm.hosted.FeatureHandler.forEachFeature(FeatureHandler.java:93)
        ... 7 more

(note, the internal exception is only visible because I ran this with -H:+ReportExceptionStackTraces).

In addition, the PR also makes sure errors and stack traces are printed consistently to stdout.