[FEATURE] ForkJoinPool: Add a fork/join pool implementation

[jerome-benoit]

A ForkJoinPool to divide a task across multiple workers, maybe we will need a design before to start and some feedbacks.

The general model: https://en.wikipedia.org/wiki/Fork%E2%80%93join_model#:~:text=In%20parallel%20computing%2C%20the%20fork,point%20and%20resume%20sequential%20execution.

Useful links:

• https://docs.oracle.com/javase/tutorial/essential/concurrency/forkjoin.html,
• http://tutorials.jenkov.com/java-util-concurrent/java-fork-and-join-forkjoinpool.html
• https://en.wikipedia.org/wiki/Work_stealing,
• https://www.igvita.com/2012/02/29/work-stealing-and-recursive-partitioning-with-fork-join/.