Make it possible to call RedisModule_FreeString() without a context. #3496
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When implementing a module data type, callbacks are made without a
RedisModuleCtx so it becomes impossible to free previously allocated
strings when necessary (e.g. on a free callback).
The other alternative is to push the context on all callbacks but it may
be reasonable to require that modules with custom data types will not
rely on auto memory for internal types.