feat: new saes for gemma-2b-it and feature splitting on gpt2-small-la…

[jbloomAus]

Description

New SAEs:

• One on Gemma-2b-IT: https://huggingface.co/jbloom/Gemma-2b-IT-Residual-Stream-SAEs
• Many on GPT2 layer 8 (for studying feature splitting): https://huggingface.co/jbloom/GPT2-Small-Feature-Splitting-Experiment-Layer-8

GPT2 small SAEs are already on Neuronpedia here.

Gemma-2b IT SAE on Neuronpedia soon.