[FEATURE] Support for Cloudflare Workers

[Stefatorus]

Is your feature request related to a problem? Please describe. There are currently no PDF readers that support Cloudflare workers.

Describe the solution you'd like Being able to use mupdf-js on workers, considering the hardware and dependency limitations it has.

Describe alternatives you've considered Currently, mupdf-js does not support it out of the box, and throws errors regarding not found modules (XMLHttpRequest)

Additional context