Natural language to query with LLM

[dianakramer]

Feature: Create queries from natural language. This will help analysts to create more efficient queries faster.

Description:

• When asking an investigation question an LLM solution will recommend queries that will filter the events in a sketch relevant to the question.
• Use prompt engineering with few-shot prompting and a pre-trained LLM model.
• Take into account the data types in a sketch.

[jkppr]

Side note: Before merging this feature we need to fix a dependency issue with the required package for using Vertex AI google-cloud-aiplatform. In some early tests of the draft PR I have encountered an incompatibility in the dependencies of unfurl. Needs further investigation.