Enrich notification-publisher logs with context

[nscuro]

Logs emitted by the notification-publisher will now include additional context about the notification record that's being processed, as well as the applicable notification rule being handled.

Additionally, both SendMailPublisher, as well as all implementations of AbstractWebhookPublisher will now emit a log message when notifications were published successfully to the configured destination.

Example log output for the WebhookPublisher:

2023-08-28 15:47:48,326 INFO  [org.hya.not.pub.WebhookPublisher] (pc-pool-5-thread-2) Destination http://localhost:34025/foo acknowledged reception of notification with status code 204 (PublishContext{kafkaTopic=dtrack.notification.new-vulnerability, kafkaTopicPartition=0, kafkaPartitionOffset=0, notificationGroup=GROUP_NEW_VULNERABILITY, notificationLevel=LEVEL_INFORMATIONAL, notificationScope=SCOPE_PORTFOLIO, notificationTimestamp=1970-01-01T00:11:06Z, notificationSubjects={component=Component[uuid=componentUuid, group=componentGroup, name=componentName, version=componentVersion], project=Project[uuid=projectUuid, name=projectName, version=projectVersion]}, ruleName=foo, ruleScope=PORTFOLIO, ruleLevel=INFORMATIONAL})

Note
The notificationSubjects field in the context object is intended to give a a surface-level overview of what entity the notification is about. The goal is to be able to quickly correlate notifications with projects, or components within those projects.

Closes #768

[sonarcloud]

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