Add advanced range/query trees (Fenwick, Segment, Interval, Order-Statistic)

[evolve75]

Add data structures for prefix/range sums, interval queries, and rank/select helpers.

[evolve75]

next already includes these advanced range/query trees: Fenwick 1b4bcb5 , SegmentTree cc01f0b , IntervalTree ddfd0f9 , and OrderStatistic 02fa3c1 .
Keeping the issue open for tracking, but the requested feature set is already implemented there.