new gpt cv conversion functionality

[erkanncelen]

Introducing GPT functionality. Using GPT-4, CVBIA now can convert any CV in pdf format to the new Xebia Data CV format.

Steps:
1- Extract text from pdf CV
2- Use GPT to extract key information from text
3- Fill in a Yaml with CVBIA format

[pgoslatara]

@erkanncelen Is the gpt.py script mature enough that it should be added to the CI pipeline? I think tesseract relies on system packages so the pipeline will need a step to perform this for Ubuntu OSes.

[guillesd]

Pydantic model 🥸