[Feature] bar series support dimension background

[skie1997]

What problem does this feature solve?

1. dimension background 需要适应不同状态的bar 系列（堆叠、百分比、并列等）
2. dimension background 需要适应不同状态的bar width
3. dimension background 需要支持圆角

What does the proposed API look like?

dimensionBackground: {
color: string;
cornerRadius: number;
}