Add assistant-service RAG-based context generation

[Ameb8]

Assistant-Service RAG

Assistant-Service must be able to provide the LLM with automatic project context for the user's prompt using RAG baased context retrieval. This is an opt-in feature

Implementation Requirements

• Can be disabled
• User's files are chunked semantically with logical/structured separators
• System must prevent identical context being included
• User must be able to see which files were provided
• LLM must be able to see which files the included chunks came from