Add support for ISO 8601 intervals

[jigargandhi]

Describe the proposal

Runtime has added support for ISO 8601 intervals for reminders as per https://github.com/dapr/dapr/issues/2513. Make changes to SDK to support accordingly

[jigargandhi]

/assign

[rynowak]

@jigargandhi - what's the user-visible impact of this? The format that we use to register reminders is an implementation detail. users work with .NET types like TimeSpan.

[jigargandhi]

Apologies if the title/description is misleading

The goal here is to provide reminders with repetitions.

The current api for an Actor to register a reminder is protected async Task<IActorReminder> RegisterReminderAsync(string reminderName, byte[] state, TimeSpan dueTime, TimeSpan period)

To support reminders with repetitions, we can add an overload protected async Task<IActorReminder> RegisterReminderAsync(string reminderName, byte[] state, TimeSpan dueTime, TimeSpan period, uint repetitions)

The reminders api do provide ability to create reminders using ISO 8601 intervals, but I think we can add that later if users want to create intervals with that format. This may be because they might get that interval from an external systems.

[yash-nisar]

/assign

[yash-nisar]

@halspang Do you want to add this to 1.10 ?