Even though google::protobuf::internal::DescriptorStringView is exposed
in public protobuf headers, it's probably not a good idea to rely on an
"internal" typedef.

According to https://protobuf.dev/news/2024-10-02/#descriptor-apis:

    v30 will update return types in descriptor (such as full_name) to be
    absl::string_view.

So `absl::string_view` is probably the right type to use here.