A Future API for Parallel Processing using mirai

Implementation of the Future API <doi:10.32614/RJ-2021-048> on top of the mirai package <doi:10.5281/zenodo.7912722>. By using this package, you get to take advantage of the benefits of mirai plus everything else that future and the Futureverse adds on top of it. It allows you to process futures, as defined by the future package, in parallel out of the box, on your local machine or across remote machines. Contrary to back-ends relying on the parallel package (e.g. multisession) and socket connections, mirai_cluster and mirai_multisession, provided here, can run more than 125 parallel R processes. As a reminder, regardless which future backend is used by the user, the code does not have to change, it gives identical results, and behaves exactly the same.