Exposes recurrence_rule endpoint for Scheduled Events

[CameronWhitworth]

Summary

Noticed "recurrence_rule" is missing from the wrapper. See Developer Docs.

Description

This PR adds support for recurring scheduled events, allowing events to be set up with iCalendar recurrence rules. This enables features like daily, weekly, monthly, and yearly recurring events.

• Added recurrence_rule field to ScheduledEvent class
• Added support for recurrence rules in create_scheduled_event and edit methods
• Updated docs where needed

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• ? This PR fixes an issue. - Might resolve ScheduledEvent dont't update repeatable events #10114
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

[DA-344]

This is a duplicate of #9685