Update `geemap.ee_to_xarray()` method for updated `xee` syntax

Unsandboxed `exec()` of LLM-generated code in `geemap/ai.py` — Arbitrary Code Execution via Prompt Injection

No reponse while downloading the data

Do not use mutable defaults for arguments

Migrating away from google-generativeai

Summary files for AI systems

Add test coverage

Rewrite conversion.py

Refactor datasets.py to not talk to the internet on import

Add a test for bump_geemap_version.py