Add ERC20TransferEvent and ERC721TransferEvent models

[lizard-boy]

What changed? Why?

• Add ERC20TransferEvent and ERC721TransferEvent models for webhook event parsing
• Minor comment update on event filter

Qualified Impact

[lizard-boy]

@greptileai

[greptile-apps]

PR Summary

This PR introduces new interfaces for ERC20 and ERC721 transfer events in the Coinbase SDK for Node.js, enhancing webhook event parsing capabilities. Key changes include:

• Added ERC20TransferEvent interface for ERC-20 token transfers
• Added ERC721TransferEvent interface for ERC-721 token transfers
• Both interfaces include detailed blockchain event information (e.g., block details, transaction details, addresses involved)
• Updated WebhookEventFilter interface with improved property descriptions

These additions will likely require updates to the Webhook class in src/coinbase/webhook.ts to properly handle and parse these new event types when received through webhooks.

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