Remove unused imports

[otomad]

Clear and concise description of the problem

The issue #341 expect do not remove unused imports, however is it possible to remove the unused imports?

If I modified the imports configs, the auto-imports.d.ts will remains existing imports, unless directly remove the auto-imports.d.ts file then it will generate correctly.

Suggested solution

Add an option in the config, cover only without merging.

Alternative

No response

Additional context

No response

Validations

• [X] Follow our Code of Conduct
• [X] Read the Contributing Guide.
• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[otomad]

@lishaobos 请问一下 cache: false 选项为何被移除了，是否有方法可以恢复原有的覆盖而不是只增不减？

目前会出现当一个导出变量被添加进入 auto-imports.d.ts 后，如果原先的变量被改名或删除，原变量名仍然存在于 auto-imports.d.ts 中，这会导致 ts 代码中键入原变量名仍然可以自动导入且不触发警告，类型变为 any，网页实际运行时就会触发未找到变量的错误。

[ilyaliao]

Closed via #549