Feature to handle duplicated test classes

[kissghosts]

Implement annotation to avoid including duplicated classes in one test suite.

In occasional cases there may be multiple same test classes in the classpath (e.g. using the following plugin to build project, same classes found both in target/test-classes/ and target/classes/):

<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>build-helper-maven-plugin</artifactId>
    <version>3.2.0</version>
    <executions>
        <execution>
            <id>add-source</id>
            <phase>generate-sources</phase>
            <goals>
                <goal>add-source</goal>
            </goals>
            <configuration>
                <sources>
                    <source>src/test/java</source>
                </sources>
            </configuration>
        </execution>
    </executions>
</plugin>

[jvanzyl]

I've added GHA CI, if you can rebase this CI will run and if it passes I'll merge it. Sorry this took so long to look at.

[kissghosts]

I've added GHA CI, if you can rebase this CI will run and if it passes I'll merge it. Sorry this took so long to look at.

Rebasing done.