http2: expand list of known headers

Add access-control-*, dnt, forwarded, trailer, tk,
upgrade-insecure-requests, warning, x-content-type-options and
x-frame-options to known list of headers for HTTP2. Expand tests
to account for these headers.

Fixes: https://github.com/nodejs/node/issues/15337
Refs: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers
Refs: https://www.w3.org/TR/cors/#syntax
Refs: https://www.w3.org/2011/tracking-protection/drafts/tracking-dnt.html#dnt-header-field
Refs: https://tools.ietf.org/html/rfc7239#section-4
Refs: https://tools.ietf.org/html/rfc7230#section-4.4
Refs: https://www.w3.org/2011/tracking-protection/drafts/tracking-dnt.html#response-header-field
Refs: https://www.w3.org/TR/upgrade-insecure-requests/#preference
Refs: https://tools.ietf.org/html/rfc7234#section-5.5
Refs: https://fetch.spec.whatwg.org/#x-content-type-options-header
Refs: https://tools.ietf.org/html/rfc7034

PR-URL: https://github.com/nodejs/node/pull/15434


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>