Automagic dispatch for universal functions (#883)

Follow up of #882, albeit more agressive on shortening the boilerplate amount of code for universal functions

This PR introduces a new _rustworkx_dispatch decorator that:

* Creates the singledispatch for func
* Automatically registers digraph_func for PyDiGraph
* Automatically registers graph_func for PyGraph

The decorator is based on the original functools.singledispatch. It should simplify the amount of code we need to write an universal function. It does add a little bit of "magic" with functools and importlib, but overall it should be maintainable

* Try to shorten Bellman-Ford

* More shortening

* Even more

* Almost done with shortening

* Finish shortening

* Fix layout incorrect default arguments

* Simplify distance_matrix

* Magic custom dispatcher

* Minor detail about is_isomorphic_node_match

* Black

* Use explicit package name

* Minor change

* Sync with main

* Black

* Minor fix

* Sync with new functions

* Synch with new functions

* Fix cargo lock

* Cargo.lock strikes again

* Fix black error

* Black fmt

* Do not explicitly export rustworkx_dispatch