Allow passing keyword arguments in zcl_cmd

[extinctpotato]

This PR adds a new parameter to the zcl_cmd service that allows passing arbitrary keyword arguments to the underlying ZHA cluster command handler. I needed it to be able to send an IR remote code to the cluster command handler in the Tuya TS1201 quirk (see https://github.com/ferehcarb/zha-device-handlers/blob/fd90c398bd746df22a5cd55e53cd3134fbd7e009/zhaquirks/tuya/ts1201.py#L125).

This is what the usage of the parameter looks like in practice:

action: zha_toolkit.zcl_cmd
metadata: {}
data:
  ieee: switch.ir_blaster_switch
  cluster: 57348
  cmd: 2
  kwargs:
    code: BXcjrhE/AuATAQF+BuAVA8AB4Acn4AMBQBvgBwFAE8ADB92ZdyPMCD8C

While implementing it, I had a constant feeling that I was overlooking something and that perhaps there was a way to pass kwargs without making modifications to zha-toolkit. If that is the case, I'd be glad if somebody shared how.