[Feature Request] Prompt for input box

### Existing Component
是

### Component Name
el-input

### Description
At present, the input box binding prompt is only wrapped with el-tooltip when rendering, but it is only required when the content length is greater than the input box length after the input box is selected or input. Otherwise, it is not necessary. The current implementation method seems to be controlled only by the disabled attribute on the el-tooltip tag. Can it be controlled through an attribute like showOverflowTooltip in the table，thank you very much！