[Feature] Bar Chart Sizing & positioning Options

### What problem does this feature solve?
`

series: [
{
type: 'pie',
radius: '61%',
center: ['30%', '60%'],
selectedMode: 'single',
.
.
.
}
]
`

The pie chart can be adjusted in size by using the radius value in the series, and the position can be adjusted by using the center value, right?

`

series: [
{
name: 'bar',
type: 'bar',
stack: 'one',
emphasis: emphasisStyle,
data: data1
},
{
name: 'bar2',
type: 'bar',
stack: 'one',
emphasis: emphasisStyle,
data: data2
},
{
name: 'bar3',
type: 'bar',
stack: 'two',
emphasis: emphasisStyle,
data: data3
},
{
name: 'bar4',
type: 'bar',
stack: 'two',
emphasis: emphasisStyle,
data: data4
}
]
`

By the way, I wonder if there is no separate option to set the size or position in the bar graph.

### What does the proposed API look like?

series: [
{
type: 'pie',
radius: '61%',
center: ['30%', '60%'],
selectedMode: 'single',
.
.
.
}
]

series: [
{
name: 'bar',
type: 'bar',
stack: 'one',
emphasis: emphasisStyle,
data: data1
},
{
name: 'bar2',
type: 'bar',
stack: 'one',
emphasis: emphasisStyle,
data: data2
},
{
name: 'bar3',
type: 'bar',
stack: 'two',
emphasis: emphasisStyle,
data: data3
},
{
name: 'bar4',
type: 'bar',
stack: 'two',
emphasis: emphasisStyle,
data: data4
}
]