Add etherlink mainnet

[devon-n]

PR-Codex overview

This PR focuses on adding support for the Etherlink Mainnet chain.

Detailed summary

Added Etherlink Mainnet chain definition in src/chains/definitions/etherlink.ts
Exported etherlink from src/chains/index.ts

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PR-Codex overview

The focus of this PR is to add support for the Etherlink Mainnet chain.

Detailed summary

• Added etherlink export in index.ts for Etherlink Mainnet chain
• Created etherlink.ts defining Etherlink Mainnet chain with ID, name, native currency, RPC URLs, block explorers, and contracts

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[changeset-bot]

🦋 Changeset detected

Latest commit: 4ef8739

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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