CTranslate2 4.4.0

Removed: Flash Attention support in the Python package due to significant package size increase with minimal performance gain.
Note: Flash Attention remains supported in the C++ package with the WITH_FLASH_ATTN option.
Flash Attention may be re-added in the future if substantial improvements are made.

New features

• Support Llama3 (#1751)
• Support Gemma2 (#1772)
• Add log probs for all tokens in vocab (#1755)
• Grouped conv1d (#1749 + #1758)

Fixes and improvements

• Fix pipeline (#1723 + #1747)
• Some improvements in flash attention (#1732)
• Fix crash when using return_alternative on CUDA (#1733)
• Quantization AWQ GEMM + GEMV (#1727)