feat(ssr): expose SSR render context

[arpowers]

Close #2574

[skirtles-code]

I know this PR is very old, but...

Isn't the functionality being added here already available with renderToString? If I've understood correctly, this PR is proposing adding something like this:

const { result, context } = await renderToContext(app)

But I think this can already be achieved using:

const context = {}
const result = await renderToString(app, context)

The output of any teleports will then be accessible via context.teleports.

Docs: https://vuejs.org/api/ssr.html#ssr-context

Perhaps I'm missing something, but I suspect this PR can be closed.

[arpowers]

Agree. Haven't had an issue with it lately. It must have been resolved.