Add Stable Diffusion 3.5 Large bf16 support

[Ilya87]

Feature Idea

I downloaded Stable Diffusion 3.5 Large in bf16 https://civitai.com/models/882666/sd35-large-google-flan with builtin clips.
I edited metadata of model to Stable Diffusion 3.5.
Try to put to unet, Stable diffusion, diff
backend #0 failed to load model with error: Model loader for sd35LargeGoogleFLAN_large3CLIPFLANBF16.safetensors didn't work - are you sure it has an architecture ID set properly?
In command line I also see nonsence message

[Warning] Your system memory usage exceeded 98.2% just before the backend process failed. This might indicate a memory overload.
 [Warning] You appear to have a sufficient pagefile (96.9 GiB), so you might have too many background processes, or you might just be trying to run too much.
 [Warning] Consider closing background processes, or greatly expanding your pagefile size.
[Warning] Or, reduce the size of what you're trying to run. If you're running an FP16 or FP8 model, consider a quantized variant like GGUF Q4

I never had 96.9 GiB pagefile. Moreover, creator of checkpoint writes "The Full BF16 model runs at an amazing speed even on my 8GB card". My card is RTX 4070. 32 GB RAM. 10000 Megabytes pagefile.

Other

Windows 11 24H2