src: combine TLSWrap/SSLWrap

SSLWrap was needlessly defined as a template class, splitting the
TLS implementation over multiple locations. The original idea, I
surmise, was to make it possible to reuse SSLWrap for some other
purpose that never manifest. This squashes them down into a single
TLSWrap class and moves tls_wrap.h/cc into src/crypto.

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

PR-URL: https://github.com/nodejs/node/pull/35552


Reviewed-By: Alba Mendez <me@alba.sh>