Support for PKCS#11 provider in OpenSSL 3.0

This patch set is a way towards support of PKCS#11 provider with OpenSSL 3.0:

https://github.com/latchset/pkcs11-provider

It is going through several self-contained changes including the removal of the usage of deprecated OpenSSL 3.0 API for the ECDSA keys and should be final. Last missing functionality is the implementation of the digest+sign operation in the pkcs11 provider if the pkcs11 module (softhsm here) does not provide the operation as a whole, but only raw ECDSA operation (https://github.com/latchset/pkcs11-provider/issues/168).

Checklist

• Commits have Signed-off-by: with name/author being identical to the commit author
• Code modified for feature
• Test suite updated with functionality tests
• Test suite updated with negative tests
• Documentation updated

Reviewer's checklist:

• Any issues marked for closing are addressed
• There is a test suite reasonably covering new functionality or modifications
• Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTING.md
• This feature/change has adequate documentation added
• No obvious mistakes in the code