[NFC] Refactor EZPreferencesWindowController into Swift

[Kyle-Ye]

A base PR to migrate Preferences System into Swift.

Also MASPreferences is a very old framework written by ObjectiveC and it has been archived by the owner on Mar 6, 2023.

Can we consider migrating into other modern Swifty framework? eg. Settings

If you agree, I'd like to split the migration into 4 steps. And everyone can do one if they had time.

1. Migrate EZPreferencesWindowController from ObjectiveC into Swift
2. Migrate other MASPreferencesViewController into Swift (Settings does not support ObjectiveC)
3. Migrate from MASPreferences -> Settings (MASPreferencesViewController -> SettingsPane)

I'll also make the Preference UI part as a standalone SwiftPM to reduce the xcodeproj dependency.

4. (Optional) Write some PreferencesViewController using SwiftUI instead of AppKit in the future

Settings supports AppKit, SwiftUI and mix them together.

[Kyle-Ye]

干掉 MASPreferences 后就不用 Easydict 自己维护一套 DarkManager 了，可以直接走 Color Asset 就行。
目前 MASPreferences 下使用这套看起来会有 bug 😂

[tisfeng]

可以的，之前我想重构设置页时也看过 Settings ，只是担心一下改动太大，不好维护，现在有你来负责 Swift 改造自然是好的 😃

用 SwiftUI 也是可以的，只是重构尽量和之前保持一致，一步步来，保持平稳过渡。

前期我可能没办法给到帮助，Swift 部份代码需要你来维护，辛苦了。

[Kyle-Ye]

用 SwiftUI 也是可以的，只是重构尽量和之前保持一致，一步步来，保持平稳过渡。

Sure. Let's do it step by step. 🚀