Qiskit / qiskit / 14602663696

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Port classical expressions (`Expr`) to Rust. (#14068)

* Initial commit.

* Implement types.

* Wire-up Rust-based Types.

* Add more plumbing for Expr.

* Expose Op enums.

* WIP

* WIP

* Test passing.

* Refactor module organization.

* Fix clippy.

* Downcast instead of extract.

* Fix merge.

* Add missing documentation, fix opcode docs.

* Impl repr for expressions.

* Fix pickling for facade enums.

* Manually revert DAGCircuit changes.

I'll do these in a separate PR.

* Fix lint.

* Use fast-rng feature for uuid.

* Address review comments.

* Address another review comment.

* Update Cargo.lock.

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