Feature: Enhanced Job Management Capabilities

[huanguan1978]

cron is a beautifully simple and powerful package. Thank you to the developers for their contributions.

#56

This commit introduces features to enhance job management within cron, built upon the existing functionality:

1. Job Class: Each job is now represented as a data class, utilizing the call function for task execution. This self-bootstrapping design enables in-class logic and job state management (run, pause, stop, delete).

2. Schedule Name: Added a name property to the Schedule class, allowing for easier identification and management of individual schedules.

3. Cron Management Methods: Introduced indexWhere, updateAt, removeAt, and count methods to the Cron class. indexWhere facilitates locating specific Schedule instances for updates or removal, enabling adjustments to trigger times and runtime states via updateAt.

The implementation has been thoroughly tested and can be found in example/jobs.dart.

I am already using this functionality in my free software project, Gai (Generative-Ai tools for beginner), which is available on Microsoft Store, winget-pkgs, Flathub, and Snapcraft.

Project URL: https://webpath.iche2.com/app/gai/download_en.html