Can we add visit count to website metrics chart?

I'm talking about this chart:

![image](

Currently it shows Visitors and Views, but now that [v2.11 introduced a simple way of calculating visits]( via visit_id, we could do something _like_ this to add a visit count stat in [getSessionStats](



In fact I did just this and that's the only change I have in my fork.

Of couse since visits last at most 1 hour, this is only really useful for daily+ charts, on hourly charts visits and visitors are always the same.