Add support for selecting specific wallet for packet clearing CLI

[adizere]

Summary

Add -k <KEY> option for clear packets CLI, just like Hermes provides one for tx raw ft-transfer -k <KEY>

Problem Definition

Hermes operators typically run one start instance in the background and then sometimes require a second instance to do packet clearing in parallel. This second instance should not be reusing the same wallet as the first, otherwise it would result in account sequence mismatch errors. Currently, it is not possible to start clear packets with a separate wallet.

Acceptance Criteria

• Add support for using a specific with option -k as part of clear packets CLI

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[seanchen1991]

I'm not sure what a key looks like. What's an example key I could use to test this flow?

[ancazamfir]

I think we should have the -k for all CLIs. Is there a way to have a generic solution for all CLIs? i.e. overwrite the key in the chain config if -k flag is present.