Add JNI Java level debugging with System Property: wolfssljni.debug=true

[cconlon]

This PR adds debug logging to JNI-level classes (com.wolfssl) with the introduction of a new System property called wolfssljni.debug=true. This can be set from the command line:

-Dwolfssljni.debug=true

Or programmatically from code:

System.setProperty("wolfssljni.debug", "true");

With this new feature the following changes were made:

• WolfSSLDebug.java class was moved from com.wolfssl.provider.jsse package down to the lower level com.wolfssl package, so the same class could be used for both JNI and JSSE level debug capabilities.
• Log messages were added to existing JNI-level classes
• JNI-level debug logs now include the native structure pointer as part of the log message header

Logs will look similar to:

2024-11-20 15:38:02.126 [wolfJNI INFO: TID 1: WolfSSL] loading native library: wolfssl
2024-11-20 15:38:02.131 [wolfJNI INFO: TID 1: WolfSSL] loading native library: wolfssljni
2024-11-20 15:38:02.132 [wolfJNI INFO: TID 1: WolfSSL] initializing wolfSSL library
2024-11-20 15:38:02.134 [wolfJNI INFO: TID 1: WolfSSL: 140241554155520] creating new WolfSSLContext
2024-11-20 15:38:02.135 [wolfJNI INFO: TID 1: WolfSSLContext: 140241554155520] entered useCertificateFile(../certs/client-cert.pem, 1)
2024-11-20 15:38:02.135 [wolfJNI INFO: TID 1: WolfSSLContext: 140241554155520] entered usePrivateKeyFile(../certs/client-key.pem, 1)
2024-11-20 15:38:02.136 [wolfJNI INFO: TID 1: WolfSSLContext: 140241554155520] entered loadVerifyLocations(../certs/ca-cert.pem, null)
2024-11-20 15:38:02.136 [wolfJNI INFO: TID 1: WolfSSLContext: 140241554155520] entered setVerify(1, VerifyCallback@49476842)
2024-11-20 15:38:02.14 [wolfJNI INFO: TID 1: WolfSSLSession: 140241403140608] creating new WolfSSLSession
2024-11-20 15:38:02.14 [wolfJNI INFO: TID 1: WolfSSLSession: 140241403140608] entered enableCRL(1)
2024-11-20 15:38:02.14 [wolfJNI INFO: TID 1: WolfSSLSession: 140241403140608] entered loadCRL(../certs/crl, type: 1, monitor: 0)
2024-11-20 15:38:02.142 [wolfJNI INFO: TID 1: WolfSSLSession: 140241403140608] entered setCRLCb(MyMissingCRLCallback@5451c3a8)
2024-11-20 15:38:02.142 [wolfJNI INFO: TID 1: WolfSSLSession: 140241403140608] entered useSessionTicket()
...

[JacobBarthelmeh]

Code changes look good. The debug configuration -Dwolfssljni.debug=true needs added as an additional test case to one of the CI tests though.

[cconlon]

Thanks, good suggestion. Please see newly-added test called test_WolfSSLSession_connectionWithDebug() inside ./src/test/com/wolfssl/test/WolfSSLSessionTest.java.