src: organize TLSWrap declarations by parent

Make it clear which of the multiple interfaces a TLSWrap method is
implementing by grouping and commenting the related methods.

PR-URL: https://github.com/nodejs/node/pull/25861


Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>