Add StoreReceptionIdentity functor

Sources/ElixxirDAppsSDK/StoreReceptionIdentity.swift

+import Bindings
+import XCTestDynamicOverlay
+
+public struct StoreReceptionIdentity {
+  public var run: (String, Data, Int) throws -> Bool
+
+  public func callAsFunction(
+    key: String,
+    identity: Data,
+    cmixId: Int
+  ) throws -> Bool {
+    try run(key, identity, cmixId)
+  }
+}
+
+extension StoreReceptionIdentity {
+  public static let live = StoreReceptionIdentity { key, identity, cmixId in
+    var error: NSError?
+    let result = BindingsStoreReceptionIdentity(key, identity, cmixId, &error)
+    if let error = error {
+      throw error
+    }
+    return result
+  }
+}
+
+extension StoreReceptionIdentity {
+  public static let unimplemented = StoreReceptionIdentity(
+    run: XCTUnimplemented("\(Self.self)")
+  )
+}