Add support to use keys and certificates from PKCS#11 provider #15587
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In OpenSSL < 3.0, the modularity was provided by mechanism called "engines". This is supported in curl, but the engines got deprecated with OpenSSL 3.0 in favor of more versatile providers.
This adds a support for OpenSSL Providers, to use PKCS#11 keys, namely through the pkcs11 provider (https://github.com/latchset/pkcs11-provider). This is done using similar approach as the engines and this is automatically built in when the OpenSSL 3 and newer is used.
Tested locally with the same steps we had for the engines (just with new OpenSSL and pkcs11-provider installed) and the basic tests worked fine. I can add some more extensive one if needed.