Add contact ID to ContactView

Examples/xx-messenger/Sources/AppCore/SharedUI/Data+hexString.swift

+import Foundation
+
+extension Data {
+  public var hexString: String {
+    map { String(format: "%02hhx ", $0) }.joined()
+  }
+}

Examples/xx-messenger/Sources/ContactFeature/ContactView.swift

@@ -108,6 +108,8 @@ public struct ContactView: View {
 
         if let dbContact = viewStore.dbContact {
           Section {
+            Label(dbContact.id.hexString, systemImage: "number")
+              .font(.footnote.monospaced())
             Label(dbContact.username ?? "", systemImage: "person")
             Label(dbContact.email ?? "", systemImage: "envelope")
             Label(dbContact.phone ?? "", systemImage: "phone")