Add ls, rm, create operations for Transfer-Scheduler to allow users to manage jobs that are going to run in the future

[jgoldverg]

Given that the frontend is adding support to running jobs in the future we need to implemented this on the Transfer-Scheduler.

Users should be able to list(ls) jobs in the future, rm(delete jobs that are scheduled before they run), and create jobs that will run in the future, as well as detail(view the job definition).

This should be done via 4 API controllers and whatever the spring framework offers for scheduling jobs in the future.