* refactor rng in noise

…ceholders

…le SQ gates at once

…nd p2

- removed setters to pivot to focus on builder
- seepage_prob -> p1_seepage_prob, p2_seepage_prob
- p_crosstalk_meas -> p_meas_crosstalk
- p_crosstalk_prep -> p_prep_crosstalk
- p_crosstalk_meas_rescale -> p_meas_crosstalk_scale
- p_crosstalk_prep_rescale -> p_prep_crosstalk_scale
- removed scales for GeneralNoiseModel params but left them in builder
- added average_p1_probability and average_p2_probability so users can enter average probability and get it automatically rescaled to total probability
- add p_meas_max as an internal GeneralNoiseModel variable to represent the overall measurement error rate
- added with_meas_probability() so users who don't want biased noise can enter just one measurement error rate

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