Add non-standard allowing variants of ReactDOMServer render methods (fixes #10064)

[dfrankland]

Adds 4 new methods to ReactDOMServer:

• renderToStringNonStandard
• renderToStaticMarkupNonStandard
• renderToNodeStreamNonStandard
• renderToStaticNodeStreamNonStandard

Each mirrors the existing:

• renderToString
• renderToStaticMarkup
• renderToNodeStream
• renderToStaticNodeStream

This allows for rendering markup that may not adhere to W3C standards, yet still works in browsers (like AMP html).

[gaearon]

This is a big API addition and we ask that those go through the RFC process: https://github.com/reactjs/rfcs

[L42y]

Any progress on this PR?

[dfrankland]

@L42y we'll need to create an RFC before proceeding on this PR. If you, or anyone else for that matter, can help create the RFC, I would be very grateful 👍

[westonruter]

This allows for rendering markup that may not adhere to W3C standards, yet still works in browsers (like AMP html).

Is this a reference to the amp-bind bracketed attribute syntax? There is now an XML-compatible syntax, so you can do data-amp-bind-foo="bar" as an alternative to [foo]="bar". See ampproject/amphtml#11115 and ampproject/amphtml#15408.

[tannerbaum]

@westonruter Am I mistaken or is this still not documented anywhere? Because I tried it out and it appears to work to me which is very handy.

[westonruter]

@THoisington You're right. I don't think docs have been made for this yet. I've opened a PR: ampproject/amphtml#19835