New Schedulers for Black Forest Flux pipelines

[ukaprch]

I have put together (2) new FLUX Schedulers for the popular FLUX Text 2 Image, Image 2 Image pipelines. One is adapted from an existing SDXL scheduler and the other is completely new in its origin. The multi-step scheduler includes (6) different samplers:
["dpmsolver2", "dpmsolver++2M", "dpmsolver++2S", "dpmsolver++sde", "dpmsolver++2Msde", "dpmsolver++3Msde"]. All have been tested and perform as expected. You will need to modify diffusers/schedulers/init.py and diffusers/init.py to import them in your project or include locally in your project.

(1) scheduling_flow_match_edm_euler.py (adapted from SDXL)
(2) scheduling_flow_match_dpmsolver_multistep.py (New: Adapted from https://github.com/crowsonkb/k-diffusion/blob/master/k_diffusion/sampling.py)
(3) Example pipeline on usage: FLUX Pipeline.txt
Both schedulers can be implemented in the conventional way with the existing FLUX pipelines.
FLUX Pipeline.txt
scheduling_flow_match_edm_euler.txt
scheduling_flow_match_dpmsolver_multistep.txt