[feat] SSL RTT in both client and server statem. SSL_get_handshake_rtt makes it available

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: David von Oheimb <david.von.oheimb@siem

[feat] SSL RTT in both client and server statem. SSL_get_handshake_rtt makes it available

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: David von Oheimb <david.von.oheimb@siemens.com>
(Merged from https://github.com/openssl/openssl/pull/20248)

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