use kotlins date system

Allow the user to run something like `delay(10.seconds) {}` for the Scheduler task. Its a kotlin date time feature iirc

Start at the Scheduler task API and inspect how delay values are currently represented and consumed. Check Kotlin's date-time duration support and determine how a call such as `delay(10.seconds) {}` should fit the existing API. Done means the Scheduler accepts this duration-style syntax and its behavior is covered by the project's available tests.

Written by the indexing model from the issue text.