[Added] Add verbosity to `VerboseLoggingMiddleware`'s hooks

[jfunka]

:tophat: What?

We added a new field subscription_message to the hooks (post_publish_success and post_process_message_success) of VerboseLoggingMiddleware.

:thinking: Why?

We want to have more in-depth information regarding the data that was sent in the topics.

:link: Related issue

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