Add option to print debug logs in JSON format

[cconlon]

This PR adds a new System property (wolfjsse.debugFormat) which can be set to JSON to output all debug log messages in JSON format. This can be helpful when logs need to be fed into tools such as DataDog.

To enable, set the System property at runtime or on the command line:

System.setProperty("wolfjsse.debug", "true");
System.setProperty("wolfjsse.debugFormat", "JSON");

-Dwolfjsse.debug=true -Dwolfjsse.debugFormat=JSON

This will cause all log messages to be output in a JSON format like so:

{
    "@timestamp": "2024-04-05 11:13:07.193",
    "level": "INFO",
    "logger_name": "wolfJSSE",
    "message": "[ WolfSSLTrustManager] entered engineInit()",
    "thread_name": "main",:
    "thread_id": "1"
}