This is a breaking change, but has a pretty big performance increase due to swapping from pandas to polars.
- Drop support for Python 3.10 and 3.11 (and add testing for 3.13 and 3.14)
- Use polars instead of pandas (~5x faster when running test suite)
- Simplify documentation so it's all in the readme
- Removed sqlite code from this library and moved into energy report repo