add GPU quantization support

• support int-8 GPU quantization
• add a tuto to perform quantization end to end
• add QDQRoberta model
• switch to ONNX opset 13
• refactoring in the TensorRT engine creation
• fix bugs
• add auth token (for private HF repo)

What's Changed

• Update triton by @pommedeterresautee in #11
• fix README.md by @pommedeterresautee in #13
• Fix install errors by @sam-writer in #20
• Add auth token by @sam-writer in #19
• Support GPU INT-8 quantization by @pommedeterresautee in #15

New Contributors

• @sam-writer made their first contribution in #20

Full Changelog: v0.1.1...v0.2.0