Sendinblue Plugin/WorkflowMessageService Suggestion

I've created my own implementation of  WorkflowMessageService.

When I used the Sendinblue plugin in overrides SendinblueMessageService  : WorkflowMessageService.

Sendinblue only overrides a single method "public override async Task<int> SendNotificationAsync".

I suggest the "public override async Task<int> SendNotificationAsync" method be moved to another service so that we can implement custom WorkflowMessageService but still use Sendinblue to actually send the email via api.

You can customize the service and plugin according to your requirements.