Log > Migrate java logging to SLF4J

[hamadodene]

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[NiccoMlt]

#500 fixed many dependency mismatches

Now, we depend from many tools that use SLF4J, but none that require JUL; we are still using JUL as our default backend for SLF4J (with slf4j-jdk14 module).

After we migrate all logs from java.util.logging APIs to SLF4J, we can drop slf4j-jdk14 and start using another backend like Logback.

Then, it would be cool to add a PMD rule to prohibit the usage of JUL (that we cannot remove from classpath because it is part of the Java standard library...)

[NiccoMlt]

Also, it would be useful to take a look at instrumentability by OpenTelemetry when choosing the backend: https://opentelemetry.io/docs/languages/java/instrumentation/#log-instrumentation