read max model len from hf config

[x574chen]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request enhances the flexibility and accuracy of determining the maximum sequence length for models within the system. It shifts from primarily relying on a fixed default or environment variables to dynamically reading the model's inherent maximum position embeddings from its configuration, ensuring that the system's operational limits align more closely with the model's capabilities. This change also provides a significantly increased default maximum length for general use.

Highlights

• Configuration Update: Increased the default value for the --max_length argument in the API server configuration from 32,000 to 128,000.
• Dynamic Model Length Determination: Implemented logic to dynamically determine the engine_max_length for the Allspark model configuration. This now considers the max_position_embeddings attribute from the model's configuration (if available) and takes the minimum of that value and the configured --max_length.
• Runtime Token Limit Alignment: Updated the Qwen-VL runtime to derive its max_total_len directly from the as_config.engine_max_length and max_input_len from max_total_len - 1, removing reliance on DS_LLM_MAX_IN_TOKENS and DS_LLM_MAX_TOKENS environment variables.

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[x574chen]

Fix #93