Qiskit / rustworkx / 9192798441

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Add `graph` module, port `contract_nodes` and `has_parallel_edges` to core. (#1143)

* Port contract_nodes to core.

* Explicit implementations for just StableGraph and GraphMap.

* Simplify to just graph_ext.

* Rename integration tests to graph_ext.

* Add module docs for graph_ext.

* Avoid 'static requirement for GraphMap extensions.

* Improve docs.

* Remove dead code.

* Add release note.

* Update releasenotes/notes/graph-ext-3f008015c31c592e.yaml

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Co-authored-by: Matthew Treinish <mtreinish@kortar.org>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

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