Add log message enhancing

[csvtuda]

Adds log message customization to the TestNG event listener. It is now possible to add arbitrary information to log messages, such as Xray annotation keys:

// Old
[Test] [some.package.SomeTest.login] success
// New
[Test] [QTAF-123] [some.package.SomeTest.login] success

The logging subscriber provides a method for registering enhancers:

    /**
     * Registers a log message enhancer which will be called whenever this subscriber prints a log message.
     *
     * @param enhancer the enhancing function
     */
    public void addLogMessageEnhancer(Function<ITestResult, Optional<String>> enhancer) {
        this.logMessageEnhancers.add(enhancer);
    }

The enhancing function receives the test result object and can decide whether to add more log output:

subscriber.addLogMessageEnhancer(testResult -> {
    Method method = testResult.getMethod();
    XrayTest xrayAnnotation = method.getAnnotation(XrayTest.class);
    if (xrayAnnotation != null) {
        return Optional.of(xrayAnnotation.key());
    }
    return Optional.empty();
});