MBP-4700 Pagination 트리거 로직을 개선하고 Secion 단위가 아닌 List 단위로 콜백받을 수 있도록 변경해요.

Sources/KarrotListKit/NextBatchTrigger/NextBatchContext.swift

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+//
+//  Copyright (c) 2024 Danggeun Market Inc.
+//
+
+import Foundation
+
+/// Manages the context for fetching the next batch of data.
+public class NextBatchContext {
+
+  /// Represents the current state of the batch fetching process.
+  public enum State {
+    /// Indicates that the fetching process is currently ongoing.
+    case fetching
+    /// Indicates that the fetching process has been completed.
+    case completed
+  }
+
+  /// The current state of the batch fetching process.
+  private(set) var state: State = .completed
+
+  /// A lock to ensure thread safety when updating the state.
+  private let lock = NSLock()
+
+  /// Begins the batch fetching process by setting the state to `fetching`.
+  func beginBatchFetching() {
+    lock.lock(); defer { self.lock.unlock() }
+    state = .fetching
+  }
+
+  /// Completes the batch fetching process by setting the state to `completed`.
+  public func completeBatchFetching() {
+    lock.lock(); defer { self.lock.unlock() }
+    state = .completed
+  }
+}