feat(comp:button): the ButtonGroup extends Space

[danranVm]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

What is the new behavior?

• ButtonGroup 使用 Space 实现，
• ButtonGroup 的 gap 即为 Space 的 size

Other information

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[codecov]

Codecov Report

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The diff coverage is n/a.

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