ds/graph: use new ds/matrix

ds/graph: Weighted BFS implementation and tests

ds/graph: implement bfs

ds: graph rewrite started

ds/genarray: (wip) initial implementation

Bitseq implementation & test & doc fixes. Move digraph

fun/* additions, particularly either, promise and future

deps: bump /x/text to >= 0.3.8

This is a routine update due to a vulnerability
(CVE-2022-32149) in a dependency.

A review determined that this repo was not affected by the
vulnerability.

text/number/symbols: shrink data tables

text/number/symbols: implement locale-appropriate CLDR number systems