Delete empty key if fails after moduleCreateEmptyKey() in module (#12129)
When `RM_ZsetAdd()`/`RM_ZsetIncrby()`/`RM_StreamAdd()` fails, if a new key happens to be created using `moduleCreateEmptyKey()`, we should clean up the empty key. ## Test 1) Add new module commands(`zset.add` and `zset.incrby`) to cover `RM_ZsetAdd()`/`RM_ZsetIncrby()`. 2) Add a large-memory test to cover `RM_StreamAdd()`.
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