FIX: Fix openssl_pkey_get_* functions

[martinssipenko]

• Fixed the input and output of the openssl_pkey_get_private function as starting from PHP 8.0 it accepts:

  • \OpenSSLAsymmetricKey|\OpenSSLCertificate|array|string for $private_key
  • null|string for $passphrase
    and returns OpenSSLAsymmetricKey|false.

• Fixed the input and output of the openssl_pkey_get_public function as starting from PHP 8.0 it accepts:

  • \OpenSSLAsymmetricKey|\OpenSSLCertificate|array|string for $public_key
    and returns OpenSSLAsymmetricKey|false.

• Added openssl_pkey_get_details function as it's actually falsy, but was not picked up by automatic code generation because of wording in PHP docs, but now is after this change.

[Kharhamel]

Thanks a lot, I will try to deploy this this week end