Review and enhance logging support for ad service service (Java)

[cartersocha]

As OpenTelemetry Logging has not fully stabilized, this list of requirements may change in future releases.

• [ ] Log events in existing services should be converted to span events where appropriate (i.e., the event occurs within a transaction)
• [ ] Logs should be emitted with OpenTelemetry resources and context for correlation where possible.
• [ ] Logs should be scraped by OpenTelemetry Collectors for further filtering and processing.

Referencing issue: https://github.com/open-telemetry/opentelemetry-demo-webstore/issues/44

Service: https://github.com/open-telemetry/opentelemetry-demo-webstore/blob/main/src/adservice/README.md