[FEATURE]编辑器支持用Arweave存证

**Is your feature request related to a problem? Please describe.**
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**Describe the solution you'd like**

- “备份储存”下增加 `Arweave`选项
- 选择了`Arweave`的话不需要配置网关，而是需要上传Arweave的 Wallet，参考[这里](https://k3u663k6emsegz7xehnaulie2jq4phvijn77tugrbwwtq4bumb4q.arweave.net/login)
- 可以在旁提供帮助，引导去装官方钱包或者通过其他途径来生成钱包，以及提供帮助文档
- 如果选择了`Arweave`作为备份存储，生成并提交 authorDigestRequestMetadata 和 authorDigestSignatureMetadata都在前端处理，花费由用户自己负担，也就是纯Web3方案
- 调用 POST /post API， authorDigestRequestMetadataStorageType 和 authorDigestRequestMetadataStorage 值为 `arweave`, authorDigestRequestMetadataRefer 和 authorDigestSignatureMetadataRefer 是arweave 的tx id

**Describe alternatives you've considered**
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**Additional context**
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