refactor: create queue reader that reads from the file system

Reads the pending tasks queue from the filesystem.

This reader is not being executed in the SDK yet. More code needs to be made before we enable any of the file system code (reader and writer).

commit-id:0a5ec736

Wendy/Classes/Store/FileSystem/FileSystemQueueReader.swift

@@ -0,0 +1,42 @@
+//
+//  FileSystemQueueReader.swift
+//  Wendy
+//
+//  Created by Levi Bostian on 2/3/24.
+//
+
+import Foundation
+
+public class FileSystemQueueReader: QueueReader {
+
+    private var queue: FileSystemQueue {
+        return FileSystemQueueImpl.shared
+    }
+
+    public func getAllTasks() -> [PendingTask] {
+        return queue.queue
+    }
+
+    public func getTaskByTaskId(_ taskId: Double) -> PendingTask? {
+        return queue.queue.first(where: { $0.taskId == taskId })
+    }
+
+    public func getNextTaskToRun(_ lastSuccessfulOrFailedTaskId: Double, filter: RunAllTasksFilter?) -> PendingTask? {
+        var potentialTasksToRun = queue.queue
+        potentialTasksToRun = potentialTasksToRun.filter {
+            guard let taskId = $0.taskId else { return false }
+            return taskId > lastSuccessfulOrFailedTaskId
+        }
+
+        if let filter = filter {
+            switch filter {
+            case .group(let groupId):
+                potentialTasksToRun = potentialTasksToRun.filter {
+                    $0.groupId == groupId
+                }
+            }
+        }
+
+        return potentialTasksToRun.first
+    }
+}