Inconsistency between the use of std::shared_ptr and nostd::shared_ptr

Describe your environment
Windows, MSVC, Using 1.8.1 tag

Steps to reproduce
Describe exactly how to reproduce the error. Include a code sample if applicable.

What is the expected behavior?
More consitent use of either std::shared_ptr or nostd::shared_ptr (e.g. same way of using it with respect to api and sdk/etc.)

What is the actual behavior?
Inconsistency where one class might return/deal with std:;shared_ptr along with nostd::shared_ptr

Additional context
Not much, and not a blocker at all. I'm working on Windows C++ dll version and re-exposing some of (what I think) are missing factories (PeriodicExportingMetricFactory, MeterProviderFactory) such that I can have single "otel.dll" that is safe to call and work with.

Please compare this:
https://github.com/open-telemetry/opentelemetry-cpp/blob/v1.8.1/sdk/include/opentelemetry/sdk/metrics/exemplar/filter.h#L35

With:
https://github.com/open-telemetry/opentelemetry-cpp/blob/v1.8.1/sdk/include/opentelemetry/sdk/metrics/exemplar/reservoir.h#L53

(and other examples)

Also I'm compiling/forcing HAVE_CPP_STDLIB so for me it doesn't matter much, but in general might be good to have consitent way of which one should be used or not (TBH, I can't fully comprehend all edge cases here, so this might've been a valid choice after all)