[NEW] Please enhance ValkeyModule_ClusterKeySlot

[allenss-amazon]

The problem/use-case that the feature addresses

Currently, this interface requires a ValkeyModuleString, this is not always a convenient format, requiring a memory allocation/free and copy of the key to be consumed.

Description of the feature

A variant of this interface that takes a data pointer and len as parameters.

Alternatives you've considered

Going slow.

Additional information

Any additional information that is relevant to the feature request.

[zuiderkwast]

If possible, please help design the feature. For example, is it possible to extend ValkeyModule_ClusterKeySlot in a backward-compatible way or do we need to add a new function?

Can this zero-copy idea be generalized to more commands?

I started a similar discussion with the Redis maintainers back in 2021, here: redis/redis#8473