Split space definition into categorial and numeric inputs

It is difficult for clients to maintain correct type security when they must supply a categorial and numeric inputs in a combined list.

A simple solution is to split the two in the input definition, e.g., `categorialSpace` and `numericSpace`

Issue 中没有确定任何文件、测试或入口点。首先定位输入定义及其 API 测试，然后验证 API 是否接受分别传入的 categorialSpace 和 numericSpace，并确认新定义已由测试覆盖。

由索引模型根据 Issue 内容生成。