feat: Deno.{Stdin,Stdout,Stderr} interfaces

[iuioiua]

While working on deprecation documentation, I realised that the documentation for Deno.{stdin,stdout,stderr} doesn't fully display on the runtime API documentation site (see here). I guess this is because these constants are of an object type rather than the interface.

This change introduces new interfaces so that their documentation is fully available. Alternatively, we can just fix the website to support object types. It's possible that users may confused between the types and constants. I.e. Deno.stdin and Deno.Stdin.

[crowlKats]

LGTM.
Indeed, type alias objects cant currently properly render, and its a tricky issue, so type aliases are preferred.
I know there are some differences between behaviour of interfaces and type aliases, but shouldnt be a problem for this scenario.

[iuioiua]

I realise we have the same issue with Deno.build, Deno.version and Temporal.Now. I'll fix those too.

[crowlKats]

Blocking approval as needs further discussion

[iuioiua]

Closing as type literal documentation is coming (denoland/deno_doc#564).