add DPM++ 2M SDE Karras sampler

[Micraow]

see: https://github.com/openvinotoolkit/stable-diffusion-webui/issues/91

Description

Add DPM++ 2M SDE Karras sampler to use DreamshaperXL

Screenshots/videos:

Checklist:

• [x] I have read contributing wiki page
• [x] I have performed a self-review of my own code
• [x] My code follows the style guidelines
• [x] My code passes tests