Add Drag/Drop with Metadata for EXR

[y0ta]

Hi,

After looking into the implementation of the metadata in png file format, I was wondering if we could add a solution for other type of data such as EXR. This is really convenient to get proper file format quality mostly used in the VFX Pipeline as standard.

To be able to store the metadata in EXR, they are in the header which is a different formatting too.

Since this is in the Js script and part of the core of comfy, we prefer to get it as a standard rather than implementing a separate solution.
Any discussion is appreciated here.

Thx