Lazy loading of JS snippets

[ranile]

Motivation

Currently all the javascript snippets are loaded when the wasm module is requested. When the entire app rendered via that module and it also requests javascript which isn't needed immediately, it causes a lot of network requests which can be delayed off.

Proposed Solution

Allow lazy loading of javascript snippets.

Alternatives

As far as I'm aware, the only solution is to load everything when the wasm module is loaded.

Additional Context

I'm making a wrapper around @material web components for Yew and want to load the javascript files as needed.