Issue #3556311: Implemented the feature to enable/disable individual email logs

1. Modified the configuration schemas to support new settings related to individual log toggling for SMTP emails.
2. Added a new configuration option in the form to enable/disable logging for individual email messages sent via the SMTP module.
3. Added checks within the code to determine whether logging is enabled for each email sent, ensuring logs are generated only when configured to do so.
4. Added configuration to enable SMTP logger by default in smtp.install and smtp.post_update.php with a default value set to TRUE.

Closes #3556311