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Add `check_input` option to `UnitaryGate` (#10660)

* Add skip_check option to UnitaryGate

This commit adds a new option to the unitary gate class's constructor,
skip_check, which is used to skip the checking on the input unitary.
When creating a unitary gates when you know the input is already unitary
checking that the input matrix is unitary is wasted CPU time. This new
option enables a user to assert the input is unitary and skip this
checking (at their own risk). The primary use case for this is the
consolidate blocks pass which is creating a large number of UnitaryGate
objects and matrix is always going to be unitary. This new flag is used
in ConsolidateBlocks to speed up the creation of gate objects.

* Rename argument check_input

* Fix rebase issues

* Update qiskit/circuit/library/generalized_gates/unitary.py

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