feat: add swan chain

[tom-jordan1]

PR-Codex overview

This PR focuses on adding new chain definitions for the Swan blockchain and its testnets, enhancing the existing chain configurations.

Detailed summary

• Added swan chain definition in src/chains/definitions/swan.ts.
• Added swanSaturnTestnet chain definition in src/chains/definitions/swanSaturnTestnet.ts.
• Added swanProximaTestnet chain definition in src/chains/definitions/swanProximaTestnet.ts.
• Updated src/chains/index.ts to export the new chains.

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PR-Codex overview

This PR introduces the Swan Chain and related testnets to the codebase, enhancing the blockchain definitions with new networks and their configurations.

Detailed summary

• Added swan mainnet with ID 254 and RPC URL https://mainnet-rpc.swanchain.org.
• Added swanSaturnTestnet with ID 2024 and RPC URL https://saturn-rpc.swanchain.io.
• Added swanProximaTestnet with ID 20241133 and RPC URL https://rpc-proxima.swanchain.io.
• Exported new chains in src/chains/index.ts.

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🦋 Changeset detected

Latest commit: d43b0f9

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