Shortern boilerplate for singledispatch (#882)

* Try to shorten Bellman-Ford

* More shortening

* Even more

* Almost done with shortening

* Finish shortening

* Fix layout incorrect default arguments

* Simplify distance_matrix

* Minor detail about is_isomorphic_node_match

* Black

* Sync with main

* Minor fix

* Sync with new functions

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Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>