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* Normalize Fee extension XML tags in EPP response Nomulus currently supports multiple versions of the Fee extensions. Our current tooling requires that each version must use a unique namespace tag, e.g., fee11, fee12, etc. Some client registrars are sensitive to the tag literal used by the version of the extension they use. For example, a few registrars currently using v0.6 have requested that the `fee` literal be used on the versions they currently use. With registrars upgrading at their own schedule, this kind of requests are impossible to satisfy. This PR instroduces a namespace normalizer class for EPP responses. The key optimization is that each EPP response never mixes multiple versions of a service extension. Therefore we can define a canonical tag for each extension, and change the tag of the extension in use in a response to that. This normalizer only handles Fee extensions right now, but the idea can be extended to others if use cases come up. This normalizer will be applied to all flows in a future PR. * Addressing reviews * A faster implementation with regex. b/478848482