[Beta] Better imports for icon components

Creating an index.ts file in components/Icon that would just import all the icon components and export them.

// components/Icon/index.ts
import {IconCopy} from './IconCopy';

export {IconCopy};

Why do this?

The old import

import {IconCopy} from '../Icon/IconCopy';

would then be replaced with

import {IconCopy} from '../Icon';

thus creating a better readable code.

从 components/Icon 和提议的入口点 components/Icon/index.ts 开始，以 IconCopy 作为导出示例。查找现有的 ../Icon/IconCopy 导入，将其替换为 ../Icon，并确认 index 导出了所有图标组件。