Add GetE2EFileTransferParams functor

Sources/ElixxirDAppsSDK/Functors/GetE2EFileTransferParams.swift

+import Bindings
+import XCTestDynamicOverlay
+
+public struct GetE2EFileTransferParams {
+  public var run: () -> Data
+
+  public func callAsFunction() -> Data {
+    run()
+  }
+}
+
+extension GetE2EFileTransferParams {
+  public static let liveDefault = GetE2EFileTransferParams {
+    guard let data = BindingsGetDefaultE2eFileTransferParams() else {
+      fatalError("BindingsGetDefaultE2eFileTransferParams returned `nil`")
+    }
+    return data
+  }
+}
+
+extension GetE2EFileTransferParams {
+  public static let unimplemented = GetE2EFileTransferParams(
+    run: XCTUnimplemented("\(Self.self)")
+  )
+}
+