Examples build is broken in Windows DLL build

[ThomsonTan]

It seems the PR #3421 change target_link_libraries(common_foo_library PUBLIC opentelemetry_api) to target_link_libraries(common_foo_library PRIVATE opentelemetry-cpp::api), but the dependency should be PUBLIC because the compile definitions on opentelemtry-cpp::api target (like OPENTELEMETRY_STL_VERSION) should be propagated from API to the final executable target which configures the SDK, or the API header file will be inconsistent in the executable and the common library.