Add READOUT_NOISE to NoiseConfig

Currently, we have READOUT_NOISE as an intrinsic accepted by clifford, cpu, and gpu simulators (base and adaptive profiles). In the future, we would like to make that configuration part of NoiseConfig as well.

Start by tracing NoiseConfig and the existing READOUT_NOISE handling in the clifford, CPU, and GPU simulators, including base and adaptive profiles. Clarify the intended configuration shape and identify the relevant tests; done means READOUT_NOISE can be configured through NoiseConfig wherever the intrinsic is currently accepted.

Written by the indexing model from the issue text.