[Review] feat(plugin): implement configurable logger for pki_default unit

[saukijan]

Description

This PR removes the use of the standard log_stdout.h from ua_pki_default.c and implements the use of a more generalized log.h in its place.

This is achieved by using a static UA_Logger variable, which is initially set to NULL and set during configuration by one of the following functions:

• UA_CertificateVerification_AcceptAll()
• UA_CertificateVerification_Trustlist()
• UA_CertificateVerification_CertFolders()

A NULL logger is acceptable since log.h checks against it, and if it is found, no logging is done, which in principal, allows for full deactivation of the logging plugin during the configuration process.

[saukijan]

This PR needs to change both the default and openssl PKI modules to pass CI tests, thus resolving the plugins/securityPolicies/openssl/ua_pki_openssl.c PR mentioned in Issue #3544 as well

[saukijan]

This PR is ready for review

[jpfr]

Please move the logger from a global pointer into the CertContext struct.
We avoid use the use of non-const global variables in the library.

Good to merge otherwise!

[saukijan]

Hey @jpfr, thanks for your input.

Please move the logger from a global pointer into the CertContext struct.

I did not notice the ContextCert before, it seems a much better fit than global ptr! I used the openssl module definition as an example and created DefalutContextCert structure, to differentiate it from the one defined in ua_pki_openssl.c

I also pulled in the latest commits from master, but that seems to have broken unit test runner for me. I keep getting errors from Python telling me that Valgrind logfile do not exist. Here is the error log:
ctest.log

Also azure pipeline keeps failing to download some dependencies for windows setup.