Improve Pipeline performance and overhead

[niemyjski]

• This will only send change notifications over the message bus if there are actually listeners removing a massive amount of load on handlers and the message bus.
• No longer save stack usage in the pipeline which is very expensive as it's highly likely to have race conditions causing lots of retries due to concurrency errors. This moves it to a job for saves making it eventually consistent.
• No longer write meta data file when writing only to the queue folder (no archiving) this reduces the IO writes by 50%
• Fixes swagger documentation.