Add UdNetworkStatus callback

Sources/ElixxirDAppsSDK/Callbacks/UdNetworkStatus.swift

+import Bindings
+import XCTestDynamicOverlay
+
+public struct UdNetworkStatus {
+  public init(handle: @escaping () -> Int) {
+    self.handle = handle
+  }
+
+  public var handle: () -> Int
+}
+
+extension UdNetworkStatus {
+  public static let unimplemented = UdNetworkStatus(
+    handle: XCTUnimplemented("\(Self.self)")
+  )
+}
+
+extension UdNetworkStatus {
+  func makeBindingsUdNetworkStatus() -> BindingsUdNetworkStatusProtocol {
+    class CallbackObject: NSObject, BindingsUdNetworkStatusProtocol {
+      init(_ callback: UdNetworkStatus) {
+        self.callback = callback
+      }
+
+      let callback: UdNetworkStatus
+
+      func udNetworkStatus() -> Int {
+        callback.handle()
+      }
+    }
+
+    return CallbackObject(self)
+  }
+}