Hey @dwi-di,
If you take a look at our Process for reviewing classic confinement snaps, the need of running kubectl is not enough for this request to be accepted (it falls under the unsupported category). If you need to support several kubectl versions, you could either a) ship them all in your snap, and then decide which one to use at runtime b) make use of snap tracks. Would either of these two options work for kafkactl?
Please remember classic snaps are not installable on Ubuntu Core devices and also run in the global mount namespace, which means great care must be taken for the snap to work reliably across distributions.