Support to quickly import or export multi-signature accounts through the `.json` configuration file (parameters need to include member + threshold + network range)

[Yakio]

Is your feature request related to a problem? Please describe.
现在导入账号太复杂了，不方便使用和分享

Describe the solution you'd like
可以 通过 json 或一段代码/口令 快速 导入导出多签配置（member+阈值+网络范围）

Describe alternatives you've considered
通过 url 来分享，如果该地址没有保存到本地，可以一键导入。（研究这个方案是否可行，关键点：如何通过一个多签地址来查询其member和阈值）

Additional context
Add any other context or screenshots about the feature request here.