xcap-js: Deno wrapper

[sigmaSd]

https://jsr.io/@sigma/xcap-js

In the future, it would be great if this works on multiple js runtimes, its not that hard really just need some time investement

Btw Maybe xcap should have an official c api , this is what I'm using for now https://github.com/sigmaSd/xcap-js/blob/master/src/lib.rs