chore: restore removed require from getting-started example

getting-started/ts-example/traced-example/tracing.ts

@@ -2,6 +2,7 @@ import { NodeTracerProvider } from '@opentelemetry/node';
 import { SimpleSpanProcessor } from '@opentelemetry/tracing';
 import { ZipkinExporter } from '@opentelemetry/exporter-zipkin';
 
+const { SemanticResourceAttributes } = require('@opentelemetry/semantic-conventions');
 const { Resource } = require('@opentelemetry/resources');
 // For Jaeger, use the following line instead:
 // import { JaegerExporter } from '@opentelemetry/exporter-jaeger';