Typing for model config properties

[alexander-held]

Summary

For upstream use in cabinetry, typing of some model config pieces would be convenient. I added something back in #1706 but only just realized that this does not carry through as intended:

import pyhf

model = pyhf.simplemodels.uncorrelated_background(
    signal=[12.0, 11.0], bkg=[50.0, 52.0], bkg_uncertainty=[3.0, 7.0]
)

reveal_type(model.config.suggested_fixed())

results in a Revealed type is "Any" by mypy. I imagine it gets lost somewhere through how the _ModelConfig structure is a property of Model?

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