feat: add getPoll snapshot endpoint

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What does this PR do?

🤖 Generated by Copilot at 63e5df2

The snapshot-relay package adds a new feature to fetch poll data by proposal id using the snapshot package. It also updates its configuration and dependencies to support TypeScript and Node.js compatibility for Cloudflare Workers.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖 Generated by Copilot at 63e5df2

• Add snapshot dependency and node_compat option to snapshot-relay package (link, link, link)
• Implement and expose getPoll function to query snapshot data by proposal id (link, link, link)

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