[Framework] Feed item filtering in the Feed List view (#11)

This PR contains the work done to implement the filtering of the items shown in the `FeedListViewController` view controller by star rating.

Reviewed-on: rock-n-code/app-reviews#11
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Libraries/UI/Kit/Sources/Extensions/UIImage+ICons.swift

@@ -0,0 +1,19 @@
+//
+//  UIImage+ICons.swift
+//  ReviewsUIKit
+//
+//  Created by Javier Cicchelli on 20/03/2024.
+//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
+//
+
+import UIKit
+
+public extension UIImage {
+    enum Icon {
+        
+        // MARK: Constants
+        public static let filter = UIImage(systemName: .Icon.filter)
+        public static let star = UIImage(systemName: .Icon.star)
+        
+    }
+}