Add new DateDividerMode.None when creating a timeline using TimelineConfiguration

[bmarty]

When loading a timeline for swiping between media, the value DateDividerMode.Montlhy is used. But then the application is filtering out the date separator.

Ideally a new enum value DateDividerMode.None would be added to prevent the SDK from adding useless date separator.

This is a P3 issue, to be seen as a small optimization, but still nice to have!

[Hywan]

@rena-ertam028 AI bots are not welcomed here. Go bother someone else.