feat(chat): add support for full code file
What does this merge request do and why?
Chat can work with selected code snippet or with whole file. We need to add support for second as well. Prompt in v1
How to set up and validate locally
Run gdk and ask Chat questions about code, you can do it also from {http://127.0.0.1:5052}/docs#/chat/chat_v2_chat_agent_post
Merge request checklist
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Tests added for new functionality. If not, please raise an issue to follow up. - [-] Documentation added/updated, if needed.