added suport for Claude 3.5 inc. function calls, improved retrieval and dataframe comprehension

This is a relatively large, and potentially breaking update.

- Added support for Anthropic Claude 3.5 including function calls (streaming)
- Major overhaul to vector storage and retrieval
- Added a functionality when data frames can be explained/described with ontology. This significantly improves the accuracy of the responses.
- Added a new agent "Dataframe Inspector"
- A bunch of changes to prompts to facilitate the new features

Author: pgalko

LLM_CONFIG_sample.json

@@ -2,6 +2,7 @@
     {"agent": "Expert Selector", "details": {"model": "gpt-4o", "provider":"openai","max_tokens": 4000, "temperature": 0}},
     {"agent": "Analyst Selector", "details": {"model": "gpt-4o", "provider":"openai","max_tokens": 4000, "temperature": 0}},
     {"agent": "Theorist", "details": {"model": "gpt-4o", "provider":"openai","max_tokens": 4000, "temperature": 0}},
+    {"agent": "Dataframe Inspector", "details": {"model": "gpt-4o", "provider":"openai","max_tokens": 4000, "temperature": 0}},
     {"agent": "Planner", "details": {"model": "gpt-4o", "provider":"openai","max_tokens": 4000, "temperature": 0}},
     {"agent": "Code Generator", "details": {"model": "gpt-4o", "provider":"openai","max_tokens": 4000, "temperature": 0}},
     {"agent": "Code Debugger", "details": {"model": "gpt-4o", "provider":"openai","max_tokens": 4000, "temperature": 0}},