Qiskit / qiskit-ibm-runtime / 27333832683

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add pec post-process functionality (#2898)

### Summary
Add support for the case pec_options is given as input.
Create a new post_process_pec function - calculate the mitigated exp_val
using the pauli_signs attribute of the results and the calculated gamma
factor of the noise model of the circuit.

### Details and comments
split https://github.com/Qiskit/qiskit-ibm-runtime/pull/2860 PR for
easier review.

partially fixes https://github.com/Qiskit/qiskit-ibm-runtime/issues/2844

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Co-authored-by: TsafrirA <113579969+TsafrirA@users.noreply.github.com>

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