Weekday/weekend breakout for headway stats

[sonicseamus]

Is your feature request related to a problem? Please describe. When viewing the headway stats for a line, the average and median are reported, which usually land somewhere between the typical weekday and weekend headways for a given line. For example, for the pre-pandemic Blue Line, weekday headways were around 6 minutes and weekend headways were around 9 minutes. The headways chart shows this clearly, but the stats simply report an average headway of 6m48s etc.

Describe the solution you'd like Duplicate the statistics section (maybe on the right side?) and report separate statistics for weekday trips and weekend trips. This way it would be easier to understand at a glance whether the T is delivering their scheduled headways, which usually are different for weekdays and weekends.

Additional context