Populate LogRecord.target in tracing-appender for logs-to-trace events

[lalitb]

The opentelemetry-appender-tracing crate provides the interop between logs and tracing through experimental flag. So the events from the library instrumented using log crate can be collected as tracing events, and forwarded to OpenTelemetry pipeline. The log.target field should be populated to LogRecord.target.

This is basically the "log.target" coming from log-to-tracing conversion. Will handle it as separate PR ?

Lets add an issue to track this too.

Originally posted by @cijothomas in https://github.com/open-telemetry/opentelemetry-rust/pull/1869#discussion_r1647966624