Feature/implement logback logger context listener code generation

[alexey-lapin]

Current implementation of logback optimizer io.micronaut.aot.std.sourcegen.LogbackConfigurationSourceGenerator incorrectly translates contextListener tags.

This PR adds generator handler for contextListener element in logback.xml:

<configuration>

    <contextListener class="ch.qos.logback.classic.jul.LevelChangePropagator"> <!-- line of interest -->
        <resetJUL>true</resetJUL> <!-- line of interest -->
    </contextListener> <!-- line of interest -->

    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <withJansi>true</withJansi>
        <encoder>
            <pattern>%cyan(%d{HH:mm:ss.SSS}) %gray([%thread]) %highlight(%-5level) %magenta(%logger{36}) - %msg%n</pattern>
        </encoder>
    </appender>
</configuration>

becomes:

LevelChangePropagator contextlistener = new LevelChangePropagator();
contextlistener.setResetJUL(true);
contextlistener.setContext(context);
contextlistener.start();
loggerContext.addListener(contextlistener);

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[alexey-lapin]

Hi @melix, @sdelamo, @graemerocher could you please take a look

[melix]

Thanks for the PR!