Hi, it's basically following the list at https://www.mediawiki.org/wiki/Writing_an_extension_for_deployment#Preparing_for_deployment - deploying a completely new code base on Wikimedia servers requires several reviews (architecture, performance, code security, etc).
It might make more sense to define which actual problem you'd like to solve, because there might be better and easier solutions than deploying this extension. (T189459 comes to my mind)
Sorry, I don't know what else to write than what I wrote in my previous comment already... Please review my previous comment. You may also want to check https://meta.wikimedia.org/wiki/Small_wiki_toolkits/Starter_kit#Questions%3F for general support - Thanks!
I'm declining this. Deploying an entirely new extension requires extraordinary effort from various WMF teams, and (among other things) it needs a developer who is willing to spend time maintaining it.
Unfortunately, there is almost zero chance this happens in the foreseeable future, so I'm declining this task to reflect reality.
If you describe what issue you intend to solve via the extension, we might be able to offer alternative solutions.