Add DPM-Solver scheduler

[LuChengTHU]

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

Add the state-of-the-art training-free fast sampler DPM-Solver, which has analytic coefficients and can greatly accelerate stable-diffusion: https://github.com/LuChengTHU/dpm-solver

Describe the solution you'd like

Add the support for DPM-Solver.

Describe alternatives you've considered

Check this repo: https://github.com/LuChengTHU/dpm-solver

Additional context

I can help to add this feature.

[LuChengTHU]

It seems that the singlestep DPM-Solver is hard to combine with the current interface of schedulers in diffusers: LuChengTHU/dpm-solver#9 (comment)

I will first try to add the multistep DPM-Solver.

[github-actions]

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