feat(content): 랭킹 탭을 추가한다

SodaLive/Sources/V2/Main/Content/Ranking/Models/AudioRankingResponse.swift

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+import Foundation
+
+struct AudioRankingResponse: Decodable {
+    let showRankChange: Bool
+    let type: AudioRankingType
+    let items: [AudioRankingItemResponse]
+}
+
+enum AudioRankingType: String, Decodable, CaseIterable, Hashable {
+    case weeklyPopular = "WEEKLY_POPULAR"
+    case rising = "RISING"
+    case revenue = "REVENUE"
+    case salesCount = "SALES_COUNT"
+    case commentCount = "COMMENT_COUNT"
+    case likeCount = "LIKE_COUNT"
+}
+
+struct AudioRankingItemResponse: Decodable, Identifiable {
+    let contentId: Int
+    let title: String
+    let creatorNickname: String
+    let rank: Int
+    let rankChange: Int?
+    let isNew: Bool
+    let coverImageUrl: String?
+
+    var id: Int { contentId }
+}