Remove quartz dependency

[varunu28]

Pull Request type

• [ ] Bugfix
• [ ] Feature
• [X] Refactoring (no functional changes, no api changes)
• [X] Build related changes (Please run ./gradlew build --write-locks to refresh dependencies)
• [ ] Other (please describe):

NOTE: Please remember to run ./gradlew spotlessApply to fix any format violations.

Changes in this PR

This fixes #11 to remove the quartz dependency

• Remove dependency on quartz
• Refactor cron creation flow to use Cron instead of CronExpression
• Impact of this change is that cron creation with a timezone is not possible but the execution time for the cron can be calculated using nextExecutionTime by providing a timezone.

[varunu28]

@jun-he Please do a round of review whenever you get a chance? I am open to feedback on how can we support cron creation along with timezone during the creation operation.

[jun-he]

@varunu28 thanks for the contribution. Will review it soon.

[jun-he]

@varunu28 can you rebase your change?

[varunu28]

@varunu28 can you rebase your change?

Done

[varunu28]

@jun-he Bump on this for review. Thanks 👍

[jun-he]

@varunu28 Will review it soon.