Adapt ExtendedStackTraceElement to Java 9+

[ppkarwasz]

Closes #1640.

This PR provides a JDK 9+ version of StackTraceElement and ExtendedStackTraceElement formatting and serialization. The formatting of these elements resembles the one used natively by the JDK:

(<classloader>/)?(<moduleName>(@<moduleVersion>)?/)?<formatting as in JDK 8>

The names of the builtin classloaders ("app", "boot", "platform") are omitted, as well as the versions of the built-in modules (unless reflective access to jdk.internal.module is forbidden) .

To test this PR, run ./mvnw verify -Pjava9-tests. Some unrelated test failures are to be expected.

[ppkarwasz]

After this PR a sample stacktrace changes from:

java.lang.RuntimeException: null
	at eu.copernik.log4j.test.XmlTest.logError(XmlTest.java:18) ~[classes/:?]
	at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1736) [?:?]
	at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1728) [?:?]
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290) [?:?]
	at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020) [?:?]
	at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656) [?:?]
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594) [?:?]
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183) [?:?]

to

java.lang.RuntimeException: null
	at eu.copernik.log4j.test@1.0.0/eu.copernik.log4j.test.XmlTest.logError(XmlTest.java:18) ~[classes/:?]
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1736) [?:?]
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1728) [?:?]
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290) [?:?]
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020) [?:?]
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656) [?:?]
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594) [?:?]
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183) [?:?]

[ppkarwasz]

A sample XML event passes from:

  <Event xmlns="http://logging.apache.org/log4j/2.0/events" timeMillis="1690800041924" thread="ForkJoinPool.commonPool-worker-19" level="INFO" loggerName="eu.copernik.log4j.test.XmlTest" endOfBatch="false" loggerFqcn="org.apache.logging.log4j.spi.AbstractLogger" threadId="15" threadPriority="5">
    <Instant epochSecond="1690800041" nanoOfSecond="924573100"/>
    <Message>Hello world!</Message>
    <Source class="eu.copernik.log4j.test.XmlTest" method="logError" file="XmlTest.java" line="19">
      <classLoaderName xmlns="">app</classLoaderName>
      <moduleName xmlns="">eu.copernik.log4j.test</moduleName>
      <moduleVersion xmlns="">1.0.0</moduleVersion>
    </Source>
    <Thrown commonElementCount="0" name="java.lang.RuntimeException">
      <ExtendedStackTrace>
        <ExtendedStackTraceItem class="eu.copernik.log4j.test.XmlTest" method="logError" file="XmlTest.java" line="18" exact="false" location="classes/" version="?"/>
        <ExtendedStackTraceItem class="java.util.concurrent.CompletableFuture$AsyncRun" method="run" file="CompletableFuture.java" line="1736" exact="true" location="?" version="?"/>
        <ExtendedStackTraceItem class="java.util.concurrent.CompletableFuture$AsyncRun" method="exec" file="CompletableFuture.java" line="1728" exact="true" location="?" version="?"/>
        <ExtendedStackTraceItem class="java.util.concurrent.ForkJoinTask" method="doExec" file="ForkJoinTask.java" line="290" exact="true" location="?" version="?"/>
        <ExtendedStackTraceItem class="java.util.concurrent.ForkJoinPool$WorkQueue" method="topLevelExec" file="ForkJoinPool.java" line="1020" exact="true" location="?" version="?"/>
        <ExtendedStackTraceItem class="java.util.concurrent.ForkJoinPool" method="scan" file="ForkJoinPool.java" line="1656" exact="true" location="?" version="?"/>
        <ExtendedStackTraceItem class="java.util.concurrent.ForkJoinPool" method="runWorker" file="ForkJoinPool.java" line="1594" exact="true" location="?" version="?"/>
        <ExtendedStackTraceItem class="java.util.concurrent.ForkJoinWorkerThread" method="run" file="ForkJoinWorkerThread.java" line="183" exact="true" location="?" version="?"/>
      </ExtendedStackTrace>
    </Thrown>
  </Event>

to

  <Event xmlns="http://logging.apache.org/log4j/2.0/events" timeMillis="1690800122073" thread="ForkJoinPool.commonPool-worker-19" level="INFO" loggerName="eu.copernik.log4j.test.XmlTest" endOfBatch="false" loggerFqcn="org.apache.logging.log4j.spi.AbstractLogger" threadId="17" threadPriority="5">
    <Instant epochSecond="1690800122" nanoOfSecond="73385600"/>
    <Message>Hello world!</Message>
    <Source classLoaderName="app" moduleName="eu.copernik.log4j.test" moduleVersion="1.0.0" class="eu.copernik.log4j.test.XmlTest" method="logError" file="XmlTest.java" line="19"/>
    <Thrown commonElementCount="0" name="java.lang.RuntimeException">
      <ExtendedStackTrace>
        <ExtendedStackTraceItem classLoaderName="app" moduleName="eu.copernik.log4j.test" moduleVersion="1.0.0" class="eu.copernik.log4j.test.XmlTest" method="logError" file="XmlTest.java" line="18" exact="false" location="classes/" version="?"/>
        <ExtendedStackTraceItem moduleName="java.base" moduleVersion="11.0.14.1" class="java.util.concurrent.CompletableFuture$AsyncRun" method="run" file="CompletableFuture.java" line="1736" exact="true" location="?" version="?"/>
        <ExtendedStackTraceItem moduleName="java.base" moduleVersion="11.0.14.1" class="java.util.concurrent.CompletableFuture$AsyncRun" method="exec" file="CompletableFuture.java" line="1728" exact="true" location="?" version="?"/>
        <ExtendedStackTraceItem moduleName="java.base" moduleVersion="11.0.14.1" class="java.util.concurrent.ForkJoinTask" method="doExec" file="ForkJoinTask.java" line="290" exact="true" location="?" version="?"/>
        <ExtendedStackTraceItem moduleName="java.base" moduleVersion="11.0.14.1" class="java.util.concurrent.ForkJoinPool$WorkQueue" method="topLevelExec" file="ForkJoinPool.java" line="1020" exact="true" location="?" version="?"/>
        <ExtendedStackTraceItem moduleName="java.base" moduleVersion="11.0.14.1" class="java.util.concurrent.ForkJoinPool" method="scan" file="ForkJoinPool.java" line="1656" exact="true" location="?" version="?"/>
        <ExtendedStackTraceItem moduleName="java.base" moduleVersion="11.0.14.1" class="java.util.concurrent.ForkJoinPool" method="runWorker" file="ForkJoinPool.java" line="1594" exact="true" location="?" version="?"/>
        <ExtendedStackTraceItem moduleName="java.base" moduleVersion="11.0.14.1" class="java.util.concurrent.ForkJoinWorkerThread" method="run" file="ForkJoinWorkerThread.java" line="183" exact="true" location="?" version="?"/>
      </ExtendedStackTrace>
    </Thrown>
  </Event>

The JSON and YAML layouts undergo similar changes.