Make dots on calendar show the number of entries on that day

[KatrinaHoffert]

Somewhat complicated because of how the drawing works and how the calendar doesn't allow access to any data what-so-ever during the application of decorators. Would have to have decorators for each number (probably just "1", "2", ... "9+").

Alternative idea would be a heat chart for spending, but that seems to have no good way to do for the way decorators work in MaterialCalendarView.