add Rootstock network: RSK Mainnet and RSK Testnet

[haycarlitos]

Description

Add Roostock network: RSK Mainnet and RSK Testnet to chains.
https://dev.rootstock.io

Additional Information

• I read the contributing docs (if this is your first contribution)

Your ENS/address: diosplan.eth

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Latest commit: e4de667

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[tmm]

Chains should now be edited/added on the Viem repository.