Export TrackData to Xcode 15 Localization catalog

xcstrings.swift

struct TrackData: Codable {
    var strings: [String: Track]
}

struct Track: Codable {
    let extractionState: String
    let localizations: [String: Localization]
}

struct Localization: Codable {
    let stringUnit: StringUnit
}

struct StringUnit: Codable {
    let state: String
    let value: String
}

let englishLocalization = Localization(stringUnit: StringUnit(state: "translated", value: "Mario Kart Stadium"))
let chineseLocalization = Localization(stringUnit: StringUnit(state: "translated", value: "瑪利歐賽車競技場"))

let track = Track(extractionState: "manual", localizations: ["en": englishLocalization, "zh-Hant": chineseLocalization])

let trackData = TrackData(strings: ["Mario Kart Stadium": track])