Improve openssl ext to generate EC keys with custom EC parameters

This change extends supported parameter when generating EC keys.

Specifically following parameters are now supported: p, a, b, order,
generator, seed, cofactory, g_x, g_y, x, y and d.

Those parameters can be passed to ec field in openssl_pkey_new options.

It also fixes some issues openssl_pkey_get_details related to SM2
support.

Closes GH-9991

Author: Eno-CN

NEWS

@@ -10,6 +10,9 @@ PHP                                                                        NEWS
   . Fixed line number of JMP instruction over else block. (ilutov)
   . Fixed use-of-uninitialized-value with ??= on assert. (ilutov)
 
+- OpenSSL
+  . Added support for additional EC parameters in openssl_pkey_new. (Eno-CN)
+
 06 Jul 2023, PHP 8.3.0alpha3
 
 - Core: