Load locale without the need of a global instance

Hello,

I'm working on a web project using `dayjs` which should load locales dynamically (using `await import('');`) from the `locales` folder of `dayjs`.
However, these files need an instance of `dayjs` available as global object, in my case I need to set `window.dayjs` which is pretty ugly.
Is there a way to load the locale and directly specify the `dayjs` instance it should use?

Thanks!

Possibly related: https://github.com/iamkun/dayjs/issues/655

Start by examining the locale files in the locales folder and how they obtain the global dayjs instance when loaded through a dynamic import. Review the possibly related issue #655 and determine whether the requested behavior can be specified without window.dayjs; done should provide a supported way to associate a locale with a chosen dayjs instance.

Written by the indexing model from the issue text.