Optimize ZUNION[STORE] by avoiding redundant temporary dict usage (#13566)
This PR is based on valkey-io/valkey#829 Previously, ZUNION and ZUNIONSTORE commands used a temporary accumulator dict and at the end copied it as-is to dstzset->dict. This PR removes accumulator and directly stores into dstzset->dict, eliminating the extra copy. Co-authored-by: Rayacoo zisong.cw@alibaba-inc.com
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