Add missing otlp exporter dependency

[psx95]

Autoconfigure SDK extension is used but has not been configured. In this case, the default otlp exporter must be present on the classpath.

Testing

• Ran the resource detection example successfully.

[punya]

Why are we adding the OTLP exporter to the classpath rather than changing the default exporter to the Google Cloud ones?

[psx95]

Why are we adding the OTLP exporter to the classpath rather than changing the default exporter to the Google Cloud ones?

No strong reason, for this example it could go either way. My thoughts were:

• Avoid adding configuration lines for Google cloud ones.
• Demonstrate default configuration.
• The purpose of this example was to show detected resource attributes which is independent of exporter choice.