Generate fluent types and preference key types

[northword]

fluent types: https://github.com/dvanoni/notero/blob/main/scripts/generate-fluent-types.ts

preference key types: #54

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需要对 zotero-types 做一些修改 (可能)：

• decalre const Zotero {} -> declare namespace Zotero {}，因为 const 不支持继承/扩展

• Zotero.Prefs.get(key: string | boolean | number) ->

  type PrefKey = string | boolean | number
  Zotero.Prefs.get(key: PrefKey)