Add LookupUD functor

Sources/ElixxirDAppsSDK/Functors/LookupUD.swift

+import Bindings
+import XCTestDynamicOverlay
+
+public struct LookupUD {
+  public var run: (Int, Data, Data, Data, UdLookupCallback) throws -> SingleUseSendReport
+
+  public func callAsFunction(
+    e2eId: Int,
+    udContact: Data,
+    udId: Data,
+    singleRequestParamsJSON: Data,
+    callback: UdLookupCallback
+  ) throws -> SingleUseSendReport {
+    try run(e2eId, udContact, udId, singleRequestParamsJSON, callback)
+  }
+}
+
+extension LookupUD {
+  public static let live = LookupUD {
+    e2eId, udContact, udId, singleRequestParamsJSON, callback in
+
+    var error: NSError?
+    let reportData = BindingsLookupUD(
+      e2eId,
+      udContact,
+      callback.makeBindingsUdLookupCallback(),
+      udId,
+      singleRequestParamsJSON,
+      &error
+    )
+    if let error = error {
+      throw error
+    }
+    guard let reportData = reportData else {
+      fatalError("BindingsLookupUD returned `nil` without providing error")
+    }
+    return try SingleUseSendReport.decode(reportData)
+  }
+}
+
+extension LookupUD {
+  public static let unimplemented = LookupUD(
+    run: XCTUnimplemented("\(Self.self)")
+  )
+}