[model] Support Qwen3next

[sufubao]

[gemini-code-assist[bot]]

Summary of Changes

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This pull request significantly expands the model support by integrating the Qwen3next model. This integration required developing a new model architecture, implementing specialized inference logic for its hybrid attention and Gated Delta Net components, and creating highly optimized Triton kernels for performance. Additionally, the underlying memory management system was enhanced to accommodate the new model's state requirements and improve modularity across existing models.

Highlights

• Qwen3next Model Integration: This pull request introduces comprehensive support for the Qwen3next model, including its unique hybrid architecture that combines traditional full attention layers with Gated Delta Net (GDN) layers. This involves new model definition, layer inference logic, and specialized weight management classes.
• Specialized Triton Kernels: To optimize performance for Qwen3next's GDN layers, several new Triton kernels have been added. These include kernels for causal 1D convolution, fused GDN gating, gated RMSNorm, Gemma RMSNorm, and a suite of Flash Linear Attention (FLA) operations for efficient chunked and recurrent computations.
• Memory Management Enhancement: The core memory manager has been refactored to introduce a get_kv_buffer method, centralizing access to KV buffers. This change has been propagated across various existing models (Bloom, Deepseek2, Llama, etc.) to ensure consistent and flexible memory handling. A dedicated Qwen3NextMemoryManager is also introduced to manage both KV and Mamba-style states.
• New Weight Parameter Types: New ParameterWeight and TpParameterWeight meta-weight classes have been added to handle specific parameter loading and tensor parallelism splitting, likely tailored for the Qwen3next model's architecture.

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