[Feature Request] Drawer, Tabs (and maybe other components) should not be `overflow: hidden`

### Existing Component
Yes

### Component Name
Drawer, Tabs, etc.

### Description
Sometimes the overflow hidden style is disruptive. I have a css (sass) override and it is fine for me, but I think it should be default. If you don't think so, feel free to close the issue without any mention.

```sass
.el-tabs__content,
.el-tabs--left,
.el-tabs--right,
.el-drawer__body,
.el-drawer
overflow: initial

.el-tabs
display: flex
flex-direction: column
&--left
flex-direction: row
&--right
flex-direction: row-reverse
&__content
flex-grow: 1
```