Add FactHelpers

Sources/XXMessengerClient/Utils/FactHelpers.swift

+import XXClient
+
+extension Array where Element == Fact {
+  public var username: String? {
+    get { first(where: { $0.type == 0 })?.fact }
+    set {
+      removeAll(where: { $0.type == 0 })
+      if let newValue = newValue {
+        append(Fact(fact: newValue, type: 0))
+        sort(by: { $0.type < $1.type })
+      }
+    }
+  }
+
+  public var email: String? {
+    get { first(where: { $0.type == 1 })?.fact }
+    set {
+      removeAll(where: { $0.type == 1 })
+      if let newValue = newValue {
+        append(Fact(fact: newValue, type: 1))
+        sort(by: { $0.type < $1.type })
+      }
+    }
+  }
+
+  public var phone: String? {
+    get { first(where: { $0.type == 2 })?.fact }
+    set {
+      removeAll(where: { $0.type == 2 })
+      if let newValue = newValue {
+        append(Fact(fact: newValue, type: 2))
+        sort(by: { $0.type < $1.type })
+      }
+    }
+  }
+}