Request: add degree_sequence_game in BGL

`igraph` has this `degree_sequence_game` [src/games.c] method to randomly create a graph with a set of degrees.

I wonder if you know if there is any implementation of that stochastic algorithm using BGL. And if not, if there is any road map on implementing it. Thanks!

[src/games.c]: https://github.com/igraph/igraph/blob/master/src/games.c