http2: use shared memory tracking implementation

The extensive testing done on http2 makes it easier to make sure
the implementation is correct (and doesn’t diverge unnecessarily).

Refs: https://github.com/nodejs/quic/pull/126


Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/30745
Refs: https://github.com/nodejs/quic/blob/34ee0bc96f804c73cb22b2945a1a78f780938492/src/node_mem.h


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>