AttributePropagatingSpanProcessor doesn't accept non-Readable spans

[zhongkechen]

Hi,

I'm encountering an error when creating an Otel span with ADOT

aws-otel-python-instrumentation/aws-opentelemetry-distro/src/amazon/opentelemetry/distro/attribute_propagating_span_processor.py

Lines 80 to 81 in 28fc34e

	elif parent_span and _is_server_kind(parent_span):
	propagation_data = self._propagation_data_extractor(parent_span)

When the parent_span isn't a ReadableSpan (e.g. a NonRecordingSpan), _is_server_kind would throw an attribute exception because the other types of span may not have the kind attribute.

My use case:

I'm using NonRecordingSpan to create a parent span placeholder, which will be filled later

        context = SpanContext(
            trace_id=self._id_generator.generate_trace_id(),
            span_id=operation_id_to_span_id(parent_id),
            is_remote=False,
        )
        placeholder_span = NonRecordingSpan(context)

        parent_context = trace.set_span_in_context(
                placeholder_span, self._extracted_context
            )

        span = self._tracer.start_span(
            name=name,
            attributes=attributes,
            start_time=_to_otel_timestamp(start_time),
            context=parent_context,
        )

My workaround is to add the expected attributes to the NonRecordingSpan I created above:

        placeholder_span.kind = SpanKind.INTERNAL
        placeholder_span.attributes = {}