feat: Observability enhancement in tracing and logging

[ssheng]

The community made the following suggestions to BentoML observability.

1. Add a configuration option to return the trace id in the response as a header.

Consider adding a traceparent header that includes the trace id in the response. I only found mentioning of such protocol by vendors, such as https://uptrace.dev/opentelemetry/opentelemetry-traceparent.html, but not any official OpenTelemetry documentation.

2. Add service.name=%(otelServiceName)s in logs generated.

otelServiceName should be configurable through an environment variable. Possibly through the OTEL_SERVICE_NAME environment name, open-telemetry/opentelemetry-specification#1677, and default to the bento name. Evaluate adding OTEL_RESOURCE_ATTRIBUTES to include any arbitrary KVPs to be logged. https://opentelemetry.io/docs/reference/specification/sdk-environment-variables/

[aarnphm]

number 2 addressed by #3825

[aarnphm]

Number 1 addressed by #3827