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.