Moves package version strings in the details namespace.
Fixes#1249
# Pull Request Checklist
Please leverage this checklist as a reminder to address commonly occurring feedback when submitting a pull request to make sure your PR can be reviewed quickly:
See the detailed list in the [contributing guide](https://github.com/Azure/azure-sdk-for-cpp/blob/master/CONTRIBUTING.md#pull-requests).
- [x] [C++ Guidelines](https://azure.github.io/azure-sdk/cpp_introduction.html)
- [x] Doxygen docs
- [x] Unit tests
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* Standardize header includes
Update sources to match guidelines
- `#include ""` when file is relative to the project
- `#include <>` when file is external to the project
Updated tests to mirror how a customer will include the header
- `#include <>`
