Review Request for #5879

[Dhaval Kumar]

Hi all, looking for reviewers for this PR: https://github.com/networkx/networkx/pull/5879

The issue for the the pull request: https://github.com/networkx/networkx/issues/5870

Description of changes:

• Added a new function bfs_layers(G, sources) in https://github.com/networkx/networkx/blob/main/networkx/algorithms/traversal/breadth_first_search.py
• Added the tests for bfs_layers(G, sources) in  https://github.com/networkx/networkx/blob/main/networkx/algorithms/traversal/tests/test_bfs.py 
  

Follows the discussion of #5879.

As suggested by Dan Schult in pull request I should rewrite descendants_at_distance(G, source, distance) using the bfs_layers(G, sources) in a new issue. If a new issue is created I would like to discuss some design choices if possible.  My apologies of if sent this mail to soon.

Thanks,
Dhaval