feat: rwkv5 world text

[wooway777]

Summary

Motivation

Closes #

Type of Change

• feat — new feature / new model
• fix — bug fix
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Test Results of Involved Models on Supported Platforms (Please attach screenshots)

Benchmark / Performance Impact

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[pengcheng888]

通用的流程里面，不应该出现对模型 "rwkv5"的特判。 这个能修改么

[pengcheng888]

觉得优先级不对。 应该命令行参数 > generation_config.json 。 这里正好反过来了

[pengcheng888]

这里可以单独提交一个pr修改。
(1) 首先的将默认的top_k 修改为None
(2) 如果有命令行参数就用命令行的topk的值
(3) 命令行不传的话，就使用generation_config.json（文件存在）的模型提供的默认值
(4) 如果generation_config.json文件不存在的话，再赋值为1 1 1.0

[pengcheng888]

baichuan等模型没有 chat_template时，就时新建了一个basic_llm_processor.py文件。 这里却直接修改了basic_llm_processor.py