Allow users to use AI and ask open ended questions about their data in Sentry

### Problem Statement

This is a tracking Issue for a feature that lets users ask any open ended question about their data in Sentry in order to help them better debug and investigate problems

### Solution Brainstorm

_No response_

### Product Area

Other

This is a broad tracking issue for open-ended AI questions about Sentry data, and it names no files, tests, or entry points. Start by identifying the existing data investigation and AI-related areas in the repository, then clarify the intended scope and acceptance criteria before implementation; done should mean users can ask open-ended questions and receive useful answers about their data.

Written by the indexing model from the issue text.