Support media entities for vision models

Problem/Motivation

Hi,

Currently the ECA Chat task has a text area for prompt. (I am currently using it for categorizing user generated
text and it works great)
For vision models, there is a need to send media items (like jpg, png etc. files) to the model for categorizing them.
So if a content contains a Media field, the file of it should be send to a Model with a prompt.
(This by the way works already in Chat Generation Explorer where you can type a prompt and under that is a file upload. )

So a file as a token maybe could be sent to the model?

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes