optimize: 仅 runtimeHistory 开启时才导出 setCreateHistoryOptions 和 getCreateHistoryOptions 方法

[kuitos]

Checklist

• npm test passes
• tests are included
• documentation is changed or added
• commit message follows commit guidelines

Description of change

• any feature?
• close https://github.com/umijs/umi/ISSUE_URL

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This change is 

[zoro-r]

runtimeHistory 如何开启？

[xinpingwang]

runtimeHistory 如何开启？

参考 https://v3.umijs.org/zh-CN/docs/config#%E9%85%8D%E7%BD%AE 创建一个配置文件，在默认导出中添加 runtimeHistory 属性（https://v3.umijs.org/zh-CN/config#runtimehistory）：

export default {
  // ...
  runtimeHistory: {},
  // ...
}