minor refactoring (deriv-com#334)

lib/services/connection/api_manager/connection_information.dart

@@ -1,7 +1,10 @@
+import 'package:meta/meta.dart';
+
 /// Connection information for a single connection.
+@immutable
 class ConnectionInformation {
   /// Initializes a new instance of the [ConnectionInformation] class.
-  ConnectionInformation({
+  const ConnectionInformation({
     required this.appId,
     required this.brand,
     required this.endpoint,
@@ -23,4 +26,23 @@ class ConnectionInformation {
 
   /// API language.
   final String language;
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is ConnectionInformation &&
+          runtimeType == other.runtimeType &&
+          appId == other.appId &&
+          brand == other.brand &&
+          endpoint == other.endpoint &&
+          authEndpoint == other.authEndpoint &&
+          language == other.language;
+
+  @override
+  int get hashCode =>
+      appId.hashCode ^
+      brand.hashCode ^
+      endpoint.hashCode ^
+      authEndpoint.hashCode ^
+      language.hashCode;
 }