Refactor SendEmailAsync to use EmailContext object

Simplified the `SendEmailAsync` method in the `IEmailService`
interface to accept a single `EmailContext` object instead of
multiple parameters. Updated the `SendingEmailConsumer` and
`LimilabsEmailService` classes to align with this change.

In `LimilabsEmailService`, refactored email construction logic
to use properties from the `EmailContext` object, including
`Sender`, `Recipients`, `Subject`, `Body`, and `IsHtml`.
Updated `ConnectAndAuthenticateSmtpAsync` to use the `Sender`
property from `EmailContext`.

These changes improve code readability, reduce parameter
complexity, and ensure consistency across the email service
implementation.

src/core/DigitalData.MessagingService.Application/Common/Interfaces/IEmailService.cs

@@ -14,5 +14,5 @@ public interface IEmailService
     /// Sends an email using the configured SMTP account.
     /// SMTP credentials are configured in appsettings.json (EmailAccount section).
     /// </summary>
-    Task SendEmailAsync(EmailAccountDto from, IEnumerable<string> recipients, string subject, string body, bool isHtml = true, CancellationToken cancellationToken = default);
+    Task SendEmailAsync(EmailContext context, CancellationToken cancellationToken = default);
 }