Need validation/debug logs for protobuf setters

[VivekSubr]

Describe your environment
Not related to env, any new version of otel-cpp

Steps to reproduce
Export span with non utf-8 attribute.

We have a large system with hundreds of traces per second, and see intermittent error logs due to non utf-8 attributes.

[libprotobuf ERROR google/protobuf/wire_format_lite.cc:577] String field 'opentelemetry.proto.trace.v1.Span.Event.name' contains invalid UTF-8 data when serializing a protocol buffer. Use the 'bytes' type if you intend to send raw bytes.

But it's very hard to root cause this, to help in these cases we believe otel-cpp should add validations/debug logs for at least set_string_value here:

opentelemetry-cpp/exporters/otlp/src/otlp_populate_attribute_utils.cc

Line 41 in 9708acb

void OtlpPopulateAttributeUtils::PopulateAnyValue(

Currently there are no checks for any of the setter functions return values and what otel-cpp does is just discard the attribute that errored and export the rest.

[marcalff]

Accepting this bug to improve logging.

Not sure if we can validate every UTF-8 strings, to investigate.

[github-actions]

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