Replace week_start integer with an enum

[omid]

Replace week_start integer with an enum

[omid]

chrono package already has this, we need to use it and re-export the enum in the SDK:
https://docs.rs/chrono/0.4.19/chrono/enum.Weekday.html

[fmeringdal]

Same as the rrule crate: https://docs.rs/rrule/0.5.9/rrule/enum.Weekday.html
I dont remember the reason on top of my head why I chose to model the week start with a number, but I guess there is no good reason.

Another semi related thing is the recurrence attribute on CalendarEvent which should ideally be modelled as an rrule string which is well defined instead of a custom Recurrence struct. Google Calendar does this, but Outlook Calendar does not.

[omid]

Yes, I mean exactly the same. 👍🏼

For Recurrence you mean this?

nettu-scheduler/scheduler/crates/domain/src/event.rs

Line 22 in 398d258

pub recurrence: Option<RRuleOptions>,

For the Rust SDK, I'm fine to use RRuleOptions.
But a better solution can be an enum, to support either rrule string or RRuleOptions. wdyt?