GTest Printer functions #3364
Description
Is your feature request related to a problem?
I am looking for PrintTo / AbslStringify functions for public types in OpenTelemetry C++ to help with GTest output.
Describe the solution you'd like
What do you want to happen instead? What is the expected behavior?
Currently, without any helper functions, GTest will just print out the raw bytes which is not very helpful.
Describe alternatives you've considered
Which alternative solutions or features have you considered?
Refer grpc/grpc@4327215. GTest requires that PrintTo be defined in the same namespace as the type. I feel uncomfortable declaring something in opentelemetry's namespace even if it is only for test.