Support for forecasting in timeseries charts

[AndrewRTsao]

As a dashboard developer, I am interested in being able to use Rill for forecasting use cases (based on historical data). For example, if I'm a business analyst or account manager, I could potentially use Rill dashboards to track usage data to identify historical trends / dig into anomalies but also forecast some of these results into the future (even setting up alerts).

Additional context: https://rilldata.slack.com/archives/C04MYR18SBT/p1715197140104679