Fix/enable init child pool on init

Created by: jfontaine-lifion

• my team needed the ability to load the child pool process and have it available before we start consuming jobs.
• Below in the PR or changes to enable the child poor class to initialize a forked process manually.
• It is infamously known that forking and NodeJS is slow and by having the child process ready at runtime we hope to reduce the time it takes to consume the first job.