Add selected state style for toolbox magicType buttons

[lingdang1007]

What problem does this feature solve?

目前 magicType 只有 normal 和 emphasis 两种状态
初始化时无法为默认选中的图标设置颜色，如果需要修改颜色只能所有的图标颜色都一起修改
无法为当前选中的类型设置不同颜色
希望能像 series 一样支持 selected 状态样式

What does the proposed API look like?

magicType: {
type: ['line', 'bar'],
// 每个类型的默认样式
iconStyle: {
line: { color: '#0FBF98' }, // 折线图：绿色
bar: { color: '#333333' } // 柱状图：灰色
},
// 或者用 selected 状态
selectedIconStyle: {
color: '#0FBF98' // 当前选中类型：绿色
},
normalIconStyle: {
color: '#333333' // 未选中类型：灰色
}
}

[echarts-bot]

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What problem does this feature solve?

Currently, magicType only has two states: normal and emphasis
During initialization, you cannot set colors for the default selected icons. If you need to change the color, you can only change all icon colors together
You cannot set different colors for the currently selected type
I hope it supports selected status styles like the series

What does the proposed API look like?

magicType: {
type: ['line', 'bar'],
Default styles for each type
iconStyle: {
line: { color: '#0FBF98' }, // Line chart: green
bar: { color: '#333333' } // Bar chart: gray
},
Or use the selected state
selectedIconStyle: {
color: '#0FBF98' // Currently selected type: green
},
normalIconStyle: {
color: '#333333' // Unselected type: gray
}
}