fix: World Chain and Unichain Sepolia chain definitions

[0xArdy]

Unichain Sepolia contracts for reference: https://docs.unichain.org/docs/technical-information/contract-addresses#l1-contracts

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PR-Codex overview

This PR focuses on adding and updating chain definitions for the World Chain, World Chain Sepolia, and Unichain Sepolia, including their configurations and contract details.

Detailed summary

• Updated chain definitions for World Chain and World Chain Sepolia.
• Added Unichain Sepolia with specific id, nativeCurrency, and contract details.
• Exported unichainSepolia, worldchain, and worldchainSepolia in src/op-stack/chains.ts.

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🦋 Changeset detected

Latest commit: dcecbfb

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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viem	Patch

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