Micrometer Tracing comes with 3 generic interfaces, SpanExportingPredicate,
SpanReporter and SpanFilter, thanks to which you can decide whether you
want to export a span, how you want to report it and how to mutate it
regardless of which tracer library you are using.
Without this change usage of these 3 interfaces is not possible
for OpenTelemetry.
With this change we're putting all SpanExporters to the
CompositeSpanExporter and apply the exporters only after predicates,
filtering and reporting took place.
See gh-34002
06aec1a9bf