cache支持hgetall命令

[chenbt-hz]

Which PikiwiDB functionalities are relevant/related to the feature request?

No response

Description

背景：
当前cache不支持hgetall，技术方面是否有可行性？

收益：
1.高命中率等场景，性能可以大幅提升
2.p99大幅提升

Proposed solution

期望的step：
1.cache支持hgetall
2.rtc支持hgetall

Alternatives considered

其他： 优化hgetall性能以及p99

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Title: =cache supports hgetall command