Extend the new_record_layer function

Extend the new_record_layer function

Add the ability to pass the main secret and length, as well as the
digest used for the KDF.

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19748)