✨ feat: 给footerConfig添加一个参数leftBottom，用以控制’版本信息‘模块

[Lands-1203]

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Name	Status	Preview	Comments	Updated (UTC)
dumi-theme-antd-style	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 29, 2023 8:19am

[arvinxx]

@Lands-1203 参数名建议改为 copyright，毕竟移动端的话并不是在左下角，大家用的时候会有疑惑的。其他 ok~

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:tada: This PR is included in version 0.27.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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