tls: reduce memory copying and number of BIO buffer allocations

Avoid copying buffers before passing to SSL_write if there
are zero length buffers involved.  Only copy the data when
the buffer has a non zero length.

Send a memory allocation hint to the crypto BIO about how much
memory will likely be needed to be allocated by the next call
to SSL_write.  This makes a single allocation rather than the BIO
allocating a buffer for each 16k TLS segment written.  This
solves a problem with large buffers written over TLS triggering
V8's GC.

PR-URL: https://github.com/nodejs/node/pull/31499


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>