Integrations: Polish the unstructured2graph usage path

[gitbuda]

• Update docs Update LightRAG docs documentation#1445
• Make a simple pipeline to ingest PDF/DOCXs -> Add unstructured2graph #92
• Publish the integration under the PyPi
• The Community Call improvements -> Add unstructured2graph improvements #98
• Measure and expose the cost of execution
  • LiteLLM
  • llm-intercept
• Make connections with existing data under Memgraph (if Memgraph already has some data)