Adds a simple parallel task executor

[idlira]

Description

This is an easy to initialize and use executor which permits to run a number of limited tasks in parallel using virtual threads.
Useful for parallel tasks not demanding a complex clustered setup. For that, our framework already offers many options.

Call sample:

ParallelTaskExecutor executor = new ParallelTaskExecutor(4);

for (int i = 0; i < 1000; i++) {
    final int taskId = i;
    executor.submitTask(() -> {
        System.out.println("Executing Task " + taskId + " on thread " + Thread.currentThread().getName());
        // Enough theory, do some real stuff in here...
    });
}

executor.shutdownWhenDone();

• tasks start running as soon as they are submitted
• shutdown will wait until the last task finishes
• current context is passed to each task

Additional Notes

• This PR fixes or works on following ticket(s): OX-11751

Checklist

• Code change has been tested and works locally
• Code was formatted via IntelliJ and follows SonarLint & best practices
• Patch Tasks: Is local execution of Patch Tasks necessary? If so, please also mark the PR with the tag.