feat: add ENS registry and universal resolver for Sepolia

[dschlabach]

Description

Adding the ENS Registry and ensUniversalResolver contracts for Sepolia so they can be supported by viem and wagmi out of the box.

Additional Information

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

Your ENS/address: schlabach.eth

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Latest commit: 0a1da8d

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[tmm]

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