Messenger example - send auth request

• Refactor user search
• Add contact feature
• Save found contacts
• Add send request feature
• Send auth request
• Fix saving my contact during registration

Examples/xx-messenger/Sources/UserSearchFeature/UserSearchResultFeature.swift

+import ComposableArchitecture
+import Foundation
+import XCTestDynamicOverlay
+import XXClient
+
+public struct UserSearchResultState: Equatable, Identifiable {
+  public init(
+    id: Data,
+    xxContact: XXClient.Contact,
+    username: String? = nil,
+    email: String? = nil,
+    phone: String? = nil
+  ) {
+    self.id = id
+    self.xxContact = xxContact
+    self.username = username
+    self.email = email
+    self.phone = phone
+  }
+
+  public var id: Data
+  public var xxContact: XXClient.Contact
+  public var username: String?
+  public var email: String?
+  public var phone: String?
+}
+
+public enum UserSearchResultAction: Equatable {
+  case start
+  case tapped
+}
+
+public struct UserSearchResultEnvironment {
+  public init() {}
+}
+
+#if DEBUG
+extension UserSearchResultEnvironment {
+  public static let unimplemented = UserSearchResultEnvironment()
+}
+#endif
+
+public let userSearchResultReducer = Reducer<UserSearchResultState, UserSearchResultAction, UserSearchResultEnvironment>
+{ state, action, env in
+  switch action {
+  case .start:
+    state.username = try? state.xxContact.getFact(.username)?.fact
+    state.email = try? state.xxContact.getFact(.email)?.fact
+    state.phone = try? state.xxContact.getFact(.phone)?.fact
+    return .none
+
+  case .tapped:
+    return .none
+  }
+}