Pair hpmc angular step potential

[melodyyzh]

Description

This PR adds angular step potential to the hpmc pair potential class.

Motivation and context

CPPotential will be replaced by the new class of pair potentials in hoomd-blue in the version 4.6 release with the removal of llvm's JIT engine. AngularStep potential is a type of pair potential that includes an isotropic component (e.g., LJ) and an angular step function that describes the patch interaction.

Partially Resolves #1652

How has this been tested?

In progress of writing validation tests.

Change log

Added:
* `pair.AngularStep` to replace `CPPPotential` for patch interactions.

Checklist:

• I have reviewed the Contributor Guidelines.
• I agree with the terms of the HOOMD-blue Contributor Agreement.
• My name is on the list of contributors (sphinx-doc/credits.rst) in the pull request source branch.

[joaander]

Validation tests run on 853ba7c merged with the step potential branch: glotzerlab/hoomd-validation#89

[joaander]

Thanks!

I revised the documentation directly. My other suggestions are below.

I also benchmarked the code to confirm that cos and a non-inlined maskingFunction are indeed performance penalties:

  76.71%  python3  _hpmc.cpython-311-x86_64-linux-gnu.so              [.] hoomd::hpmc::IntegratorHPMCMono<hoomd::hpmc::ShapeSphere>::update(unsigne◆
   5.64%  python3  _hpmc.cpython-311-x86_64-linux-gnu.so              [.] hoomd::hpmc::PairPotentialAngularStep::maskingFunction(double, hoomd::vec▒
   2.86%  python3  libm.so.6                                          [.] __cos_fma                                                                ▒
   1.26%  python3  _hpmc.cpython-311-x86_64-linux-gnu.so              [.] void hoomd::hpmc::move_rotate<3u, hoomd::RandomGenerator>(hoomd::quat<dou▒
   1.08%  python3  _hoomd.cpython-311-x86_64-linux-gnu.so             [.] hoomd::SFCPackTuner::generateTraversalOrder(int, int, int, int, int, unsi▒
   0.97%  python3  _hpmc.cpython-311-x86_64-linux-gnu.so              [.] hoomd::hpmc::PairPotentialAngularStep::energy(double, hoomd::vec3<double>▒
   0.60%  python3  [unknown]                                         

perf reports these two methods as the top two after the main MC update method.

[joaander]

Thanks!

[melodyyzh]

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