feat(networks): add gensyn testnet

[dancoombs]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
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PR-Codex overview

This PR introduces a new testnet configuration for Gensyn Testnet, enhancing the blockchain infrastructure by defining its properties, including RPC URLs and block explorers.

Detailed summary

• Added gensynTestnet configuration in chains.ts.
• Defined properties for gensynTestnet:
  • id: 685685
  • name: "Gensyn Testnet"
  • nativeCurrency: Ethereum with symbol "eth" and 18 decimals
  • RPC URLs for default, public, and Alchemy
  • Block explorer details with name and URL
  • Marked as a testnet

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