Same parameters and row shape as GET /football/standings, read from basketball's data.
As with football, group rows by stage.id and group.id to draw each table. In basketball
every row has a group: e.g. the NBA's "Eastern Conference" and "Western Conference"
(regular season and preseason), the NBA Cup groups, one per NCAA conference, or "Group A"..
of a FIBA qualifier stage. A team has one row per group it is in. group also carries a
scope (Regular Season, Preseason, Group Stage, ...).

statistics use basketball types (WON, LOST, STREAK, HOME_WON, ...). Values are
integers: types ending in _X10 / _X1000 are scaled (WON_RATE_X1000 750 = 0.750,
POINTS_AVG_X10 1125 = 112.5). Not every league has every type. points is often null.