The `jquery.cookie` and `mediawiki.cookie` scripts are both quite small. Both separately and combined, they don't really make sense to me to register as their own top-level bundle. But at least as a first step we can combine the two.
This would also be a good time to acknowledge the fact that we have forked jquery-cookie (ref [change 655719](https://gerrit.wikimedia.org/r/c/mediawiki/core/+/655719/1/resources/lib/jquery.cookie/jquery.cookie.js), and clean up and simplify the code to align with our current best practices.
`jquery.cookie` can be an alias for `mediawiki.cookie`, to be removed once core and bundled/wmf exensions have migrated.
Although we don't yet have a deprecation policy for modules and other frontend code, it seems fair that given its widespread use, we should keep the alias in at least one stable release. We'll also want to notify Tech News and perhaps wait for, or help make happen, a [tourbot](https://github.com/Krinkle/mw-tool-tourbot) to fix the majority of simple gadget dependencies and `mw.loader` calls.
This migration can already start today because `mediawiki.cookie` naturally depends on (and thus provides) `jquery.cookie`.
NOTE: We are **not** deprecating `$.cookie`. This function will continue to be provided as a low-level interface for direct cookie reads. Use of the higher-level `mw.cookie` interface is and remains completely optional. This task is about the bundle in which these JavaScript codes are delived from the server to the browser. The module name `jquery.cookie` will deprecated once its contents have been merged into `mediawiki.cookie`.