feat: statesync script for rs testnet

[faddat]

Description

This PR adds a statesync script for the replicated security testnet.

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[mpoke]

@faddat Could you please provide more context on the need for testnet scripts in cosmos/gaia? There are already similar scripts in cosmos/testnets, i.e.,
https://github.com/cosmos/testnets/blob/master/replicated-security/provider/join-rs-provider.sh
https://github.com/cosmos/testnets/blob/master/replicated-security/provider/join-rs-provider-cv.sh

[faddat]

This one does not require using Ubuntu, and is in the gaia repository for easier testing.

[mpoke]

and is in the gaia repository for easier testing

By adding it to the Gaia repo it means that the repo will contain more artifacts that need to be maintain. As it's testnet related, the best place for it is in cosmos/testnets

[github-actions]

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