feat(bigquery): Add OpenTelemetry Samples

[whuffman36]

For the sample integration tests, I created a custom span exporter to write the span data to standard output. The pre-built logging span exporter was not allowing the integration tests to correctly capture the output.

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• samples/snippets/src/main/java/com/example/bigquery/EnableOpenTelemetryTracing.java:19, tag bigquery_enable_otel_tracing
• samples/snippets/src/main/java/com/example/bigquery/EnableOpenTelemetryTracingWithParentSpan.java:19, tag bigquery_enable_otel_tracing_with_parent_span

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