Add argument to `generatePacketDataCmd` CLI to use proper encoding format

[crodriguezvega]

Pre-requisites:

• feat(ica)!: support json tx encoding for interchain accounts #3796

Add extra argument(s) to generatePacketDataCmd to use the proper encoding format (proto or JSON, at the moment of writing) for the messages in the ICA packet data.

The argument(s) could be:

• The encoding type itself.
• The port ID and channel ID of the ICA channel, so that the encoding type could be figured out from the version of the channel

For Admin Use

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