New Features
- Add `PathIntegralAnnealingSampler`, a `SimulatedAnnealingSampler`
style wrapper for the dwave-pimc repository. This supports
simulation of path-integral dynamics and equilibrium sampling of
quantum Boltzmann distributions ([King et al., 2021](https://www.nature.com/articles/s41467-021-20901-5)).
- Add `RotorModelAnnealingSampler`, a `SimulatedAnnealingSampler`
style code for rotor model simulation. This supports a standard
classical algorithm for approximation of spin dynamics ([Shin et
al., 2014](https://doi.org/10.48550/arXiv.1401.7087)).
Bug Fixes
- Add all keyword args of `SimulatedAnnealingSampler.sample` to
`SimulatedAnnealingSampler.parameters`. This allows effective use of
`dimod.Sampler.remove_unknown_kwargs`