The `_detail` and `_internal` namespace should be the last one in the chain of namespace following SDK design precedence

We currently have types in headers that are in the `_detail` namespace which contain sub-namespaces like `Cryptography`.
https://github.com/Azure/azure-sdk-for-cpp/blob/0e699e4c7a39078daba7d902f9ee9b5b98b1b5cf/sdk/tables/azure-data-tables/inc/azure/data/tables/internal/cryptography/url_encode.hpp#L12

The existing precedence in the SDK is that `_detail`/`_internal` is the last component of the namespace.
See examples:
https://github.com/Azure/azure-sdk-for-cpp/blob/0e699e4c7a39078daba7d902f9ee9b5b98b1b5cf/sdk/core/azure-core/inc/azure/core/internal/cryptography/sha_hash.hpp#L18
https://github.com/Azure/azure-sdk-for-cpp/blob/0e699e4c7a39078daba7d902f9ee9b5b98b1b5cf/sdk/core/azure-core/inc/azure/core/internal/credentials/authorization_challenge_parser.hpp#L15-L16

cc @RickWinter