Expose Timeline-Oriented Context/Hook

[rjray]

When trying to implement a new marker-type (based on the existing TodayMarker component), I ran into the need for access to a function called getLeftOffsetFromDate which is available through the TimelineStateProvider context value (defined in src/lib/timeline/TimelineStateContext.tsx). That module also exports a hook (useTimelineState) that can return this function.

However, neither the hook nor the consumer-half of the context (TimelineStateConsumer) are exported by the package itself. So I'm unable to make use of them in my code.

Describe the solution you'd like

I would like to see these values made accessible to the developer, either as part of the overall exporting done by src/index.ts or through a different path.

Describe alternatives you've considered

I considered duplicating the code itself, but it relies on the current date-values of the left and right edges of the calendar, which also come from the context provider.

Additional context

My goal in doing this was to work around the fact that the CSS governing the TodayMarker (and, I assume, the other marker varieties) is hard-coded and very difficult to override.