Int8 fusing

[BobaZooba]

Description

Now it will be possible to fuse LoRA models into bitsandbytes int8. This will allow fusing 7B models in Colab.

Type of Change

• 📚 Examples / docs / tutorials / dependencies update
• 🔧 Bug fix (non-breaking change which fixes an issue)
• 🥂 Improvement (non-breaking change which improves an existing feature)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 🔐 Security fix

Checklist

• I've updated the code style using make codestyle.
• I've written tests for all new methods and classes that I created.

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