Add MessengerVerifyContact function

Sources/XXMessengerClient/Messenger/Functions/MessengerVerifyContact.swift

+import Foundation
+import XCTestDynamicOverlay
+import XXClient
+
+public struct MessengerVerifyContact {
+  public enum Error: Swift.Error, Equatable {
+    case notConnected
+    case notLoggedIn
+  }
+
+  public var run: (Contact) throws -> Bool
+
+  public func callAsFunction(_ contact: Contact) throws -> Bool {
+    try run(contact)
+  }
+}
+
+extension MessengerVerifyContact {
+  public static func live(_ env: MessengerEnvironment) -> MessengerVerifyContact {
+    MessengerVerifyContact { contact in
+      guard let e2e = env.e2e() else {
+        throw Error.notConnected
+      }
+      guard let ud = env.ud() else {
+        throw Error.notLoggedIn
+      }
+      let facts = try contact.getFacts()
+      let verifiedContact: Contact?
+      if facts.isEmpty {
+        var lookupResult: Result<Contact, NSError>!
+        let semaphore = DispatchSemaphore(value: 0)
+        _ = try env.lookupUD(
+          e2eId: e2e.getId(),
+          udContact: try ud.getContact(),
+          lookupId: try contact.getId(),
+          singleRequestParamsJSON: env.getSingleUseParams(),
+          callback: .init { result in
+            lookupResult = result
+            semaphore.signal()
+          }
+        )
+        semaphore.wait()
+        verifiedContact = try lookupResult.get()
+      } else {
+        var searchResult: Result<[Contact], NSError>!
+        let semaphore = DispatchSemaphore(value: 0)
+        _ = try env.searchUD(
+          e2eId: e2e.getId(),
+          udContact: try ud.getContact(),
+          facts: facts,
+          singleRequestParamsJSON: env.getSingleUseParams(),
+          callback: .init { result in
+            searchResult = result
+            semaphore.signal()
+          }
+        )
+        semaphore.wait()
+        verifiedContact = try searchResult.get().first
+      }
+
+      guard let verifiedContact = verifiedContact else {
+        return false
+      }
+
+      return try e2e.verifyOwnership(
+        received: contact,
+        verified: verifiedContact,
+        e2eId: e2e.getId()
+      )
+    }
+  }
+}
+
+extension MessengerVerifyContact {
+  public static let unimplemented = MessengerVerifyContact(
+    run: XCTUnimplemented("\(Self.self)")
+  )
+}