TonicExporterBuilder methods span_exporter_builder and metric_exporter_builder are no longer public-- why?

[meryl-c]

Hi there! I was wondering why the TonicExporterBuilder methods span_exporter_builder and metric_exporter_builder are no longer public, whereas the same methods in HttpExporterBuilder are still public. It looks like this changed in optentelemetry-otlp v0.27.0. We previously had a method that built one of these two builders with the same configurations, and then either built a MetricExporter or a SpanExporter, but now we have to duplicate that same code across modules.