[Feature Request] Why does the el-input component not have a width attribute to define the occupied width?

### Existing Component
是

### Component Name
el-input

### Description
Normally, with el-input, it always defaults to the width of the container that fills it. If there is a width attribute in the el-input tag to define its width, it will be better than if you define a class name in the tag to modify its style, or directly use the inline style to modify its width.