Implement the canShare() and share() methods for Navigator

[sinking-point]

Motivation

I would like to be able to invoke the native sharing interface when available in a project I'm working on, so that users can share the link to any platform they like, rather than only ones I've specifically added share links for.

Proposed Solution

Implement Navigator.canShare() and Navigator.share() in web_sys::Navigator.

Alternatives

The only alternative I can think of would be interfacing with JavaScript directly in my code. The proposed solution is clearly superior because it makes things much more convenient for anyone who wants to use the share API.

Does anyone know how to do this?