feat: universalresolver v3 support

[TateB]

This PR uses the Universal Resolution ENSIP for a stable UniversalResolver API, which will become the canonical entrypoint to ENS. The API, when used with the UniversalResolver proxy (TBC) will allow clients to migrate automatically to ENSv2 on launch. For reverse resolution, the new API also enables ENSIP-19's chain-specific reverse resolution process by providing a coinType.

Changes:

• Added evmChainIdToCoinType helper func
• Added chainId and coinType param to getEnsName() for L2 reverse lookups
• Added chainId param to getEnsAddress() for parity
• Removed legacy UniversalResolver error handling

Remaining tasks:

• Add UniversalResolver proxy address (currently using hardcoded)
• Add tests for chainId-specific getEnsName() requests (not yet deployed on mainnet)

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Latest commit: eeba902

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