Auxdata kwarg harmonization in expected / observed data

[alexander-held]

Description

The API for expected and observed data (from model / workspace) uses two different names for the kwarg to steer whether auxdata should be included in the return value:

import pyhf

model = pyhf.simplemodels.uncorrelated_background(
    signal=[12.0, 11.0], bkg=[50.0, 52.0], bkg_uncertainty=[3.0, 7.0]
)
print(model.expected_data([0.0, 1.0, 1.0], include_auxdata=False))

ws = pyhf.Workspace.build(model, [52.0, 53.0])
print(ws.data(model, with_aux=False))

expected_data uses include_auxdata, while data uses with_aux. I am opening this issue to suggest harmonizing the naming.

Is your feature request related to a problem? Please describe.

I occasionally confuse the kwarg names, of course a very minor problem.

Describe the solution you'd like

Harmonization of the kwargs.

Describe alternatives you've considered

Sticking with current state, and/or using higher-level interfaces (cabinetry.model_utils) to avoid having to remember the name.

Relevant Issues and Pull Requests

none

Additional context

none