It would be useful to have EdgesView(source_vertices, target_vertices) be the list of edges with one end in source_vertices and one end in target_vertices.

CC: @dcoudert

Component: graph theory

Author: David Coudert

Branch/Commit: 50ee7b8

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/34447