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Add a new set of defrag functions that take a defrag context and allow defragmenting memory blocks and RedisModuleStrings. Modules can register a defrag callback which will be invoked when the defrag process handles globals. Modules with custom data types can also register a datatype-specific defrag callback which is invoked for keys that require defragmentation. The callback and associated functions support both one-step and multi-step options, depending on the complexity of the key as exposed by the free_effort callback.