Fixes formatter to allow external use

What does this MR do and why?

Few more tweaks to make this usable.

• Noticed a bug with the notification in the formatter not being referenced properly.
• Updates activesupport to ~> 7.1 since that's the minimum needed to use active_support/broadcast_logger which is used in runtime/logger.rb
• Moves influxdb-client as a runtime_dependency

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