Qiskit / qiskit / 19683743567

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Commit Message

Add `qk_dag_successors` and `qk_dag_predecessors` to the C API (#15346)

* Add DAG node successors and predecessors functions

This commit adds `qk_dag_successors` and `qk_dag_predecessors` to retrieve
the neighbors of a given DAG node.
The information is returned through a new output struct called `QkDagNeighbors`.
The struct data is cleared using the new `qk_dag_neighbors_clear` function.

* Update crates/cext/cbindgen.toml

Co-authored-by: Jake Lishman <jake@binhbar.com>

* Update crates/circuit/src/dag_circuit.rs

Co-authored-by: Jake Lishman <jake@binhbar.com>

* Address review comments

* Return neighbors struct by value instead of using an output parameter
* Collect directly to Box<[u32]>
* Explicitly document that CDagNeighbors should be treated as read-only
* Update release note and testing

---------

Co-authored-by: Jake Lishman <jake@binhbar.com>
Co-authored-by: Jake Lishman <jake.lishman@ibm.com>

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