[WIP] Nuxt 2 support

[steveworkman]

Fixes #9

So far this is a refactor of the render code to split it for nuxt 2 and nuxt 3

[steveworkman]

ToDo:

• Nuxt 2 tests don't run because the webpack configuration validation fails saying that /\.js$/i is not a regular expression 🤯
• Wrap the Vite plugin in an unplugin to get it wrapping components in Webpack
• Re-work the Vue2 server rendering wrapper - the one in here right now is not in use

[steveworkman]

However, with it in its current state, the nuxt 2 playground runs and builds in SSR mode without crashing and most of the components hydrate correctly. DSD is not added but that will be solved by the above changes

[steveworkman]

Today I replaced the @open-wc/import-meta-loader with one that resolves local file paths rather than just webpack localhost ones. This is fine in dev, but it doesn't build, saying it can't find the module. If I get that to find the module, it complains that source.replace is not a function - seemingly some objects other than strings are being passed through it, and it falls over.

Beyond that, vue-server-renderer for nuxt 2 needs the fs module that it is trying to load client-side, and beyond that, the latest nuxt RC is causing the component that is loaded first to be added as another document fragment, instead of replacing the SSR one, I think due to nuxt/framework#7527 or nuxt/framework#7713.

I'm no longer sure that the current approach of wrapping components will work, and we should look at rendering hooks instead

[prashantpalikhe]

Closing this for now. We can revisit it later if we want to add the Nuxt2 support.

[HomWang]

Help nuxt2