add logging to avro version detection

[radai-rosenblatt]

its sadly common for users to have multiple avro versions on the classpath, sometimes shoved into innocent-looking jars.

we could add logging to our version detection code -

avro-util/helper/helper/src/main/java/com/linkedin/avroutil1/compatibility/AvroCompatibilityHelper.java

Line 710 in 144d4a0

private static AvroVersion detectAvroVersion() {

- that would print which classes were examined, out of what jars (getProtectionDomain().toString() on each class) and what was the result.

this would help diagnosing issues