Add Upscayl's REALESRGAN WDN v3 for General Image x4+ Upscaling

[hollowaykeanho]

Description

Please provide a short description of what feature you're looking forward to
add into the existing repository below. Please include the story behind your
idea as well to give a better visualization of your idea.

Upscayl's team recently trained another REALESRGAN WDN v3 models. Let's add it in.

Expected Behavior

Please specify the expected behavior of your requested feature. Some great and
helpful pointers are your expected interface (e.g. command patterns, simple
sketches of the user interface, etc).

Upscayl's team's REALESRGAN WDN v3 models is available.

Current Absent Behavior

Please specify the current behavior (e.g. workaround, blockage, etc).

Upscayl's team's REALESRGAN WDN v3 model is unavailable.

Attachment

Please drag and drop the necessary data files (e.g. screenshot, logs, etc)
below.

[hollowaykeanho]

committed in 17b11c4f1ff72e82c917a1a0c18c1b30eb57b60e