This change updates the `SimulationScheduler` class to implement the
`Dispatcher` interface from the OpenDC Common module, so that OpenDC
modules only need to depend on the common module for dispatching future
task (possibly in simulation).

This change updates the build configuration to use Spotless for code
formating of both Kotlin and Java.

This change introduces a new class, `SimulationScheduler`, which
provides the basis for simulations in OpenDC by allowing components to
schedule future tasks using delay-skipping queue and a virtual clock.

This new class is written in Java to remove any dependency on the
Kotlin and kotlinx-coroutines runtime when not necessary.