Closes #167

I also saw requests for Falcon3-10B-1.58b being made in the mainline llama.cpp and llamafile repositories, so decided to add the ability to use this model with ik_llama.cpp.

1. Get a ternary model in Microsoft's I2_S format. E.g., for Falcon3-10B-1.58b

huggingface-cli download tiiuae/Falcon3-10B-Instruct-1.58bit-GGUF

2. Re-quantize to one of the ternary quantization types in this repository. E.g.,

./bin/llama-quantize --allow-requantize path_to_model/ggml-model-i2_s.gguf output.gguf iq2_bn

Works on the CPU and GPU (CUDA or Metal)

Enjoy!

I see perplexity is quite high (higher than the Falcon3 7B Instruct ternary model), so not sure how useful this model is in practice.