FEAT: Image recognition in PDF files

[onebottlekick]

enabled image recognition in PDF files

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[stefan-rink]

There is already a PR addressing this:
#1285

I'm not sure which implementation is the better one, but I'd rather reuse the already existing llm caption helper instead of creating a new one for each converter. This is already refactored in this PR: #1254

Your LLM implementation is missing the arg llm_prompt from the image converter and llm_caption helper. This has not been passed down correctly, but i created a PR myself to fix this, so really would be better to have only one implementation and not multiple with different args used.