FEAT: Add resource to manage Scheduled Reminders

Could the provider be updated to support Github Managed Scheduled Reminders?

Scheduled reminders deliver a daily, prioritized list of pull requests waiting for review—right to your team’s Slack channel. Teams can choose how often to receive reminders and can set filters to reduce noise and ensure the most important reviews are never missed or delayed.

### References

- https://docs.github.com/en/github/setting-up-and-managing-organizations-and-teams/managing-scheduled-reminders-for-your-organization
- https://github.blog/2020-04-21-stay-on-top-of-your-code-reviews-with-scheduled-reminders/