src: separate out NgLibMemoryManagerBase

Extracted from the [QUIC PR](https://github.com/nodejs/node/pull/32379

)

So far, this is only used by the QUIC PR directly but the change itself
is independent of QUIC, even if not used directly by anything else yet.
Separated out per request.

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

PR-URL: https://github.com/nodejs/node/pull/33104


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>