Multi column configuration is added to the [feature request] form form

### Existing Component
是

### Component Name
el-form

### Description
form表单并不一定全部是一列，如果表单控件比较多，又不想出现滚动条，这样就只能采用多列的方案

Start with the el-form component named in the request and inspect how its current layout configuration works. Clarify the expected multi-column API, supported form controls, responsive behavior, and acceptance criteria before implementation; done should include documented behavior and tests for the chosen configuration.

Written by the indexing model from the issue text.