feat(okx): enable all supported EVM chains

[0xh3rman]

Summary

• Add 18 new EVM chains to OKX provider supported assets: Ethereum, SmartChain, Polygon, Arbitrum, Optimism, AvalancheC, OpBNB, Fantom, Gnosis, Blast, ZkSync, Linea, Celo, Sonic, Abstract, Berachain, Unichain, Monad
• Companion PR in core-ts: feat(okx): enable all supported EVM chains core-ts#129

Test plan

• cargo check -p swapper passes
• Integration test with live OKX API on new chains

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly expands the asset support for the OKX provider by integrating a wide array of new EVM-compatible blockchains. This enhancement broadens the functionality of the swapper, allowing users to interact with a much larger ecosystem of decentralized applications and assets across various networks through the OKX platform.

Highlights

• EVM Chain Support Expansion: Added 18 new EVM chains to the OKX provider's supported assets, including Ethereum, SmartChain, Polygon, Arbitrum, Optimism, AvalancheC, OpBNB, Fantom, Gnosis, Blast, ZkSync, Linea, Celo, Sonic, Abstract, Berachain, Unichain, and Monad.
• Companion Pull Request: A companion pull request in the core-ts repository (feat(okx): enable all supported EVM chains core-ts#129) is associated with these changes.

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[gemini-code-assist]

Code Review

This pull request expands the list of supported chains for the "okx" provider within the swapper crate, adding numerous new chains such as Ethereum, Polygon, Arbitrum, and AvalancheC. The review feedback suggests sorting this expanded list of chains alphabetically to improve readability and maintainability, making it easier to manage future additions.