Add Label component

**Is your feature request related to a problem? Please describe.**
Since we already have TextInput, Checkbox, and almost all the Form components, we need also to add a new `Label` component to be used with the `TextInput`

**Describe the solution you'd like**
Adding new `Label` component to be used with Forms components.

**Describe alternatives you've considered**
Manually adding `Text` component with custom styles.

**Additional context**
Adding new `Label` component makes it much easier to deal with forms.

首先查看现有的 TextInput、Checkbox 和其他 Form 组件，以了解它们的结构和使用模式。根据这些组件确定 Label 组件预期的 API 和样式，然后验证它是否可以按要求与表单组件一起使用。

由索引模型根据 Issue 内容生成。