[Feature Request]: Implement scheduler selection independent of sampler a la A1111

[not-ski]

Is there an existing issue for this?

• I have searched the existing issues and checked the recent builds/commits

What would your feature do ?

See AUTOMATIC1111/stable-diffusion-webui#15333

The sampler dropdown is getting a little ridiculous in length now (especially on dev2), and we are arbitrarily limited from selecting certain sampler/scheduler combinations (i.e. DPM++ 3M SDE AYS).

Would be a lot better to implement a separate dropdown for scheduler selection, similar to what A1111 has done recently-ish.

Proposed workflow

1. Go to ....
2. Press ....
3. ...
4. ???
5. Profit

Additional information

No response