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? Or if there is any other way of doing it, like with AI automator then that could be fine.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes