[Feature]: Extract final SSL certificate

[FafnerKeyZee]

Is your feature request related to a problem? Please describe.

Should be nice to be able to get the ssl certificate for the final page.

Describe the solution you'd like

Have the full certificate with AC.
using: openssl s_client --servername NAME HOST:PORT
or any equivalent to it.

Describe alternatives you've considered

No response

Additional context

No response

[Rafiot]

The har contains some of the relevant values:

        "_serverPort": 443,
        "_securityDetails": {
          "protocol": "TLS 1.2",
          "subjectName": "alkotoxv.com",
          "issuer": "R3",
          "validFrom": 1651043421,
          "validTo": 1658819420
        }

But no hash, or full content at this point.

Related feature request on playwright: microsoft/playwright#14754