fix: Cannot build quick perf from sources

- Review fixes

Resolves #220

Signed-off-by: Esta Nagy <nagyesta@gmail.com>

Author: nagyesta

jvm/jfr-annotations/src/main/java/org/quickperf/jvm/jmcrule/JmcRuleCountMeasureExtractor.java

@@ -35,6 +35,7 @@
 public class JmcRuleCountMeasureExtractor implements ExtractablePerformanceMeasure<JfrRecording, JmcRulesMeasure> {
 
     public static final JmcRuleCountMeasureExtractor INSTANCE = new JmcRuleCountMeasureExtractor();
+    //We need to ignore some rules which appear to throw NullPointerException in org.openjdk.jmc:flightrecorder.rules.jdk:8.x.y
     private static final List<Class<? extends IRule>> IGNORED_RULES = Arrays.asList(
             HighJvmCpuRule.class,
             GcStallRule.class,