Qiskit / qiskit-terra / 5616555013

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Optimize `ConsolidateBlocks` pass (#10365)

* Initial: Introducing speedup by calculating matrix

* Lint: Reformat using Black

* Fix: Added `basis_count` and `outside_basis`

* Fix: Use `Operator` if `to_matrix` is unavailable.

* Fix: Default to Operator when necessary
- Will default to previous method when blocks have more than 2 qubits.
    - This is a temporary measure.

* Lint: Removed Cyclic import

* Docs: Added release note.

* Docs: Added reference to the issue.

* Fix: Move `block_to_matrix` to ~.passes.utils

* Lint: Fixed cyclical import and order

* CI: Removed type checking

* Add: Exceptions on `_block_to_matrix`

* Docs: Fix release note.

* Fix: Change import path for block_to_matrix

* Update qiskit/transpiler/passes/utils/block_to_matrix.py

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Co-authored-by: ewinston <ewinston@us.ibm.com>

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