feat: Intent recognition: 1) The prompt template can be customized. 2) Output reason is configurable. 3) Show the system prompt in the execution detail.

[wangliang181230]

What this PR does / why we need it?

Intent recognition:

1. feat: The prompt template can be customized.
2. feat: Output reason is configurable.
3. optimize: Show the system prompt in the execution detail.

Summary of your change

在使用部分大模型时，默认的系统提示词有时候还是无法很好的判断连续对话的连贯性，我认为是提示词与大模型的兼容性不好，或者对于所选大模型来说不够完善。
现将 提示词模板 做成可自定义，默认情况下填充原来的提示词模板。

注：经测试此次调整向下兼容，可安全升级。

1. 新特性：意图识别 节点的 提示词模板 可自定义配置了（默认值根据语言变更）。

   1. 默认提示词模板截图：
   
   2. 可以自定义修改提示词模板，甚至可以提示大模型只输出意图ID数值，如图：
   
   3. 默认提示词按所选语言变更

2. 新特性：意图识别 节点，是否输出理由 支持可配置化了；
   添加该功能的原因：在 生产环境 下，可以配置 不输出理由，能减少 意图识别 的耗时，还能稍微减少token消耗。
   一般在 开发、测试阶段 才需要开启它来观察意图识别的理由。

   界面截图：
   

3. 优化：意图识别 的执行详情中，展示 系统提示词。
   界面截图：
   

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• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

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