Wire up Redelegate Message for Cosmos

[keefertaylor]

Modeled off of this tx: https://www.mintscan.io/cosmos/txs/64E36A97CC7C8BCB85856FB38D6EE48E830EFFFD9C370015C147BBD060522C12
(hit the JSON button in the top right to see the raw JSON message)

This hooks up a new CosmosRedelegateMessage. This transaction has a few fields:

• from - tx sender
• srcValidator - validator redelegating from
• destvalidator - validator delegating to
• amount - amount to redelegate

The Airgap communication format assumes there's only one to address. Rather than break the format or introduce a new one, we concatenate the addresses into the to field, such that if

to = `${srcValidator}${destValidator}`

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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