fix(event-handler): add new resolvers top-level import

Author: heitorlessa

Diff for: aws_lambda_powertools/event_handler/__init__.py

@@ -2,7 +2,7 @@
 Event handler decorators for common Lambda events
 """
 
-from .api_gateway import ApiGatewayResolver
+from .api_gateway import ALBResolver, APIGatewayHttpResolver, ApiGatewayResolver, APIGatewayRestResolver
 from .appsync import AppSyncResolver
 
-__all__ = ["AppSyncResolver", "ApiGatewayResolver"]
+__all__ = ["AppSyncResolver", "APIGatewayRestResolver", "APIGatewayHttpResolver", "ALBResolver", "ApiGatewayResolver"]