fix: compatibility with pyhf 0.6.3 (parameter label API, auxdata)

[alexander-held]

scikit-hep/pyhf#1536 (see also discussion in scikit-hep/pyhf#867) added model.config.par_names() to the pyhf model config API. This provides the same functionality as cabinetry.model_utils.parameter_names, but the parameter names are now also passed through to MINUIT. A fix is included to pass the correct names when using MINOS (they used to be x0, x1 etc.). cabinetry.model_utils.parameter_names is removed, since the functionality is now available directly in pyhf.

The parameter naming format has changed: parameter[bin_0] -> parameter[0] etc., and the index is now included even for parameters like shapesys/shapefactors that only have a single component (because there is only a single bin in the region, see scikit-hep/pyhf#1560).

scikit-hep/pyhf#1562 introduces an API change for the auxdata kwarg naming, from with_aux to include_auxdata. cabinetry used with_aux also in its own API, and this now switches to include_auxdata for consistency with pyhf.

Due to a typing-extensions requirements conflict that results in the tensorflow-probability installation being incompatible with the installed tensorflow version (see also scikit-hep/pyhf#1595, tensorflow/tensorflow#51743), the pyhf[backends] installation is removed from the cabinetry test setup extra. It is now available via a new pyhf_backends setup extra and installed only when needed for the backend tests. That allows installing a working tensorflow setup (and picks up a conflict with black that does not matter at that point in the CI, as black already ran earlier).

Breaking changes:

• removed cabinetry.model_utils.parameter_names in favor of the pyhf implementation model.config.par_names()
• model_utils.model_and_data and model_utils.asimov_data: renamed with_aux kwarg to include_auxdata for consistency with pyhf
• test setup extra no longer includes all pyhf backends, now moved to pyhf_backends setup extra

* breaking change: removed model_utils.parameter_names in favor of model.config.par_names provided by pyhf
* breaking change: renamed with_aux arguments in model_utils to include_auxdata for consistency with pyhf
* breaking change: pyhf backends removed from cabinetry test setup extra
* parameter naming format changed from parameter[bin_0] to parameter[0]
* raised minimum required pyhf version to v0.6.3

[matthewfeickert]

scikit-hep/pyhf#1560 is probably going to affect this PR, given that this PR is in response to scikit-hep/pyhf#1536, but I haven't looked over it so you might be fine.

[alexander-held]

Thanks for the heads-up! scikit-hep/pyhf#1560 does not interfere with this, as now the actual parameter naming format is irrelevant to cabinetry (no more magic needed to match the old MINOS names).

[codecov]

Codecov Report

Merging #248 (cd17d8d) into master (e45e89f) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #248   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           19        19           
  Lines         1798      1787   -11     
  Branches       279       275    -4     
=========================================
- Hits          1798      1787   -11     

Impacted Files	Coverage Δ
src/cabinetry/fit/__init__.py	100.00% <100.00%> (ø)
src/cabinetry/model_utils.py	100.00% <100.00%> (ø)

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