feat: Add extension for creating data from data url (#3474)

ios/Capacitor/Capacitor/Data+Capacitor.swift

@@ -0,0 +1,22 @@
+extension Data: CapacitorExtension {}
+public extension CapacitorExtensionTypeWrapper where T == Data {
+
+    static func data(base64EncodedOrDataUrl: String) -> Data? {
+        if isBase64DataUrl(base64EncodedOrDataUrl) {
+            if let url = URL(string: base64EncodedOrDataUrl) {
+                do {
+                    return try T(contentsOf: url)
+                } catch {
+                    return nil
+                }
+            }
+            return nil
+        } else {
+            return T(base64Encoded: base64EncodedOrDataUrl)
+        }
+    }
+
+    private static func isBase64DataUrl(_ base64EncodedOrDataUrl: String) -> Bool {
+        return  base64EncodedOrDataUrl.starts(with: "data:") && base64EncodedOrDataUrl.contains("base64,")
+    }
+}