feat: add Omax mainnet

[Zhangnong]

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PR-Codex overview

This PR focuses on adding support for the Omax Mainnet to the codebase, including its definition and export in the appropriate files.

Detailed summary

• Added a new entry for Omax Mainnet in the .changeset/strong-pandas-change.md.
• Exported omax from src/chains/index.ts.
• Created a new definition for omax in src/chains/definitions/omax.ts with details such as:
  • id: 311
  • name: 'Omax Mainnet'
  • nativeCurrency: 'OMAX'
  • rpcUrls: 'https://mainapi.omaxray.com'
  • blockExplorers: 'https://omaxscan.com'
  • testnet: false

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[changeset-bot]

🦋 Changeset detected

Latest commit: cdbcd2e

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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