a-space size=0 is invalid

[linziguan]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

3.0.0-beta.4

Environment

chrome86、vue3.2

Reproduction link

http://no

Steps to reproduce

官网提到弃用button.group，改成space组件。

What is expected?

如果确定是用space替换button.group的话，建议支持，使得按钮中间空隙为0，并且按钮紧凑显示。

What is actually happening?

设为0是不生效

[github-actions]

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