Move Json and Xml classes to their respective namespaces (#189)
* Move Json and Xml classes to their respective namespaces
* ⚙️chore(dependencies) add hyperf/codec to composer.json files
* ⚙️chore(confd): update exception class in Nacos driver
* ⚙️chore(dependencies) Remove unused package and clean up composer.json file.
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Co-authored-by: Deeka Wong <8337659+huangdijia@users.noreply.github.com>