Add LoadReceptionIdentity functor

Sources/ElixxirDAppsSDK/LoadReceptionIdentity.swift

+import Bindings
+import XCTestDynamicOverlay
+
+public struct LoadReceptionIdentity {
+  public var run: (String, Int) throws -> Data
+
+  public func callAsFunction(
+    key: String,
+    cmixId: Int
+  ) throws -> Data {
+    try run(key, cmixId)
+  }
+}
+
+extension LoadReceptionIdentity {
+  public static let live = LoadReceptionIdentity { key, cmixId in
+    var error: NSError?
+    let data = BindingsLoadReceptionIdentity(key, cmixId, &error)
+    if let error = error {
+      throw error
+    }
+    guard let data = data else {
+      fatalError("BindingsLoadReceptionIdentity returned `nil` without providing error")
+    }
+    return data
+  }
+}
+
+extension LoadReceptionIdentity {
+  public static let unimplemented = LoadReceptionIdentity(
+    run: XCTUnimplemented("\(Self.self)")
+  )
+}