chore: moved constructor initializers into a separate init function s…

…o that I can use async await

packages/logging_cloudwatch/aws_logging_cloudwatch/lib/src/remote_constraint_provider.dart

@@ -38,8 +38,7 @@ class DefaultRemoteLoggingConstraintProvider
     required AWSCredentialsProvider credentialsProvider,
   })  : _config = config,
         _credentialsProvider = credentialsProvider {
-    _fetchAndCacheConstraintFromEndpoint(); // Fetch once immediately on initialize
-    _refreshConstraintPeriodically();
+    init();
   }
 
   final DefaultRemoteConfiguration _config;
@@ -61,6 +60,15 @@ class DefaultRemoteLoggingConstraintProvider
   @override
   String get runtimeTypeName => 'DefaultRemoteLoggingConstraintProvider';
 
+  /// Initializes the [DefaultRemoteLoggingConstraintProvider] by fetching
+  /// the constraint from the endpoint initially and then
+  /// starting the refresh timer afterwards.
+  Future<LoggingConstraint?> init() async {
+    await _fetchAndCacheConstraintFromEndpoint();
+    await _refreshConstraintPeriodically();
+    return null;
+  }
+
   Future<void> _saveConstraintLocally(LoggingConstraint constraint) async {
     await storage.saveConstraintLocally(constraint.toJson());
   }