Setup classpath items for OpenTelemetry with Accumulo 2.1 and later

Running Accumulo 2.1.0-SNAPSHOT, I expected to be able to see trace information printed to the console or something, when I ran `trace on` in the Accumulo shell (launched with `uno ashell`). This didn't happen because the requisite OpenTelemetry dependencies are not on the class path by default. It would be a nice feature to get this working. I'm not sure what the default sink should be for Uno... perhaps a sink that sends traces to an slf4j logger? We want to keep it simple, after all.