This is separated out of the QUIC PR. It is not specific to QUIC but
provides a new base class that is used there as an abstraction of
the actual implementation. This is a purely internal implementation
detail that has no outward functional changes (so no need for tests)

Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/33289
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: David Carlier <devnexen@gmail.com>

Moves state that is specific to HTTP/2 into the HTTP/2 implementation
as a cleanup.

PR-URL: https://github.com/nodejs/node/pull/32538
Reviewed-By: James M Snell <jasnell@gmail.com>

../src/node_http_common.h:497:8: warning: 'MemoryInfo' overrides a
member function but is not marked 'override' [-Winconsistent-missing-override]
  void MemoryInfo(MemoryTracker* tracker) const {

PR-URL: https://github.com/nodejs/node/pull/32126
Refs: https://github.com/nodejs/node/pull/32069
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

The nghttp2 and nghttp3 (used in the QUIC implementation) share nearly
identical structs for header handling. However, they differ enough that
they need to be handled slightly different in each case. This PR
includes some elements introduced in the QUIC PR separated out to
make them independently reviewable, and updates the http2 implementation
to use the shared utilities.

Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/32069
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>