refactor: modularize email processing logic and improve service structure

- Extract email template handling, rendering, and sending code into `Worker.Services` project.
- Introduce `EmailTemplateService`, `EmailTemplateRenderingService`, and `SendEmailService`.
- Simplify consumer logic by delegating to scoped services.
- Update project dependencies and package references accordingly.

HrynCo.NotificationService.Worker/Program.cs

@@ -1,8 +1,7 @@
 using HrynCo.NotificationService.DAL.EF;
-using HrynCo.NotificationService.Services;
 using HrynCo.NotificationService.Worker;
+using HrynCo.NotificationService.Worker.Services;
 using Hrynco.RabbitMq;
-using Microsoft.Extensions.Options;
 
 var builder = Host.CreateApplicationBuilder(args);
 
@@ -14,7 +13,7 @@ var appSettings = builder.Configuration
 
 builder.Services.AddSingleton(appSettings);
 builder.Services.AddNotificationDataAccess(appSettings.ConnectionString);
-builder.Services.AddNotificationServices();
+builder.Services.AddNotificationWorkerServices();
 
 builder.Services.Configure<RabbitMqSettings>(
     builder.Configuration.GetSection($"{AppSettings.SectionName}:RabbitMq"));
@@ -22,4 +21,4 @@ builder.Services.Configure<RabbitMqSettings>(
 builder.Services.AddHostedService<SendEmailConsumer>();
 
 var host = builder.Build();
-host.Run();
+host.Run();