feat: groq image vision provider

[rferrari]

Relates to

Action: DESCRIBE_IMAGE

Risks

Low

Modified the core/runtime.ts and plugin-node/service/image.ts files.
As it is core files, maybe it can affect others plugins.

Background

What does this PR do?

This PR includes the "class GroqImageProvider implements ImageProvider"
that is used to describe images using the llama-3.2-90b-vision-preview Model.

What kind of change is this?

Improvements (now image description works with Groq)

Why are we doing this? Any context or related work?

This feature is to use an Vision Image Provider supported by Groq llama vision models that i`m working with.

Documentation changes needed?

My changes do not require a change to the project documentation.

Testing

configure Groq as Model provider
Send an image asking to agent describe it.

Before new feature	After new feature

Where should a reviewer start?

packages/plugin-node/src/services/image.ts LN:193
packages/core/src/runtime.ts LN:352

Detailed testing steps

Discord username

vaipraonde

[monilpat]

LGTM :)