slot auto split, solve the problem of too many preset slots

[chejinge]

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

No response

Description

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Proposed solution

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Alternatives considered

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Title: slot auto split, solve the problem of too many preset slots

[AlexStocks]

@sunjiajun

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@sunjiajun

[EnableAsync]

整体思路：

1. 修改 maxSlotNum 变量
2. 重新调用 SlotsRebalance 方法更新 slots（当前测试存在问题，需要对 SlotsRebalance debug）

具体思路：

1. 修改 model.initSlotNum 的类型为 sync.Mutex
2. 修改 SetMaxSlotNum 方法
3. 在 Dashboard 中添加 SetMaxSlotNum(num int) 方法允许设置 maxSlotNum
4. debug SlotsRebalance 方法实现 slot 重新划分
5. 修改 codis-fe 中 slot 的相关逻辑

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the whole idea:

1. Modify maxSlotNum variable
2. Recall the SlotsRebalance method to update slots (there is a problem in the current test and SlotsRebalance needs to be debugged)

Specific ideas:

1. Modify the type of model.initSlotNum to sync.Mutex
2. Modify the SetMaxSlotNum method
3. Add SetMaxSlotNum(num int) method in Dashboard to allow setting maxSlotNum
4. debug SlotsRebalance method to implement slot re-division
5. Modify the relevant logic of slot in codis-fe

[chejinge]

思路没问题 需要注意的是 pika和codis都需要修改config配置，另外迁移数据需要打开slotmigrate及slotsreload

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The idea is OK. It should be noted that both pika and codis need to modify the config configuration. In addition, to migrate data, slotmigrate and slotsreload need to be turned on.