feat : Implement slot-based MGET batching for cluster clients

[SoulPancake]

For #844

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[SoulPancake]

I optimised the slice mem allocation, is there any other potential improvement I can work on? @rueian

[rueian]

I optimised the slice mem allocation, is there any other potential improvement I can work on? @rueian

I wonder if it is possible to avoid using MGets since it allocates a make(map[uint16]Completed, 8) though I am not sure if it is allocated on the heap or the stack after compiler optimization. Would you mind checking that? If it is allocated on the stack, then it should be fine.

[SoulPancake]

I wonder if it is possible to avoid using MGets since it allocates a make(map[uint16]Completed, 8) though I am not sure if it is allocated on the heap or the stack after compiler optimization. Would you mind checking that? If it is allocated on the stack, then it should be fine.

@rueian make(map[uint16]Completed, 8) in MGets/JsonMGets does escape to heap. What do you suggest we do here

[rueian]

What do you suggest we do here

1. Try inline MGets/JsonMGets manually.
2. Then replacing make(map[uint16]Completed, 8) with make(map[uint16]int, 8) where the values are the indexes of cmds.s, eliminating the use of slotCmds.

[SoulPancake]

I have some trouble will my personal laptop, I will address these in a week approx, hope that is okay

[SoulPancake]

@rueian I inlined the grouping logic:

1. Added CRC16 hashing and slot calculation functions (copied from internal/cmds/slot.go) to helper.go for key-to-slot mapping. Let me know if I should move this to a common util?
2. Replaced the intl.MGets/intl.JsonMGets calls with manual key grouping into a map[uint16][]string.
3. Built the command slice (cmds.s) directly using the client builder (client.B().Mget().Key(group...).Build().Pin() for MGet, and similarly for JsonMGet with path).
4. Maintained a parallel cmdKeys slice to track keys per command for response parsing.
5. Eliminated the intermediate slotCmds map of Completed structs, reducing heap pressure while preserving functionality.

[SoulPancake]

Hi @rueian Any chance to review this?