The former is only supported from Python 3.10 onwards and we'd like to support Python 3.9 onwards.

list is only supported from Python 3.10 onwards, and we'd like to support 3.9 onwards.

Mostly just trying to make MyPy happy!

installed poetry and ran make.  added mistralai to the pyproject.toml (first time using poetry, nice tool)

new encoder and a new LLMS. The encoder is a
simple wrapper around the MistralAI API, and the
LLMS is a simple wrapper around the encoder.
The encoder is tested with a simple unit test,
and the LLMS is tested with a simple unit test.

Also made sure it's used properly in layer.py.