fix(functions): add RateLimitError in Deno.errors namespace

[nyannyacha]

This PR adds a custom error type for rate-limiting introduced in supabase/edge-runtime#670.

[coderabbitai]

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• packages/core/functions-js/src/edge-runtime.d.ts

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📝 Walkthrough

Summary by CodeRabbit

• New Features
  • Added RateLimitError exception for handling rate-limit scenarios with optional retry-after timing information.

Walkthrough

This change introduces a new RateLimitError class to the Deno.errors namespace in the edge runtime type definitions. The class extends the standard Error and includes a retryAfterMs property of type number | null to indicate when a rate-limited operation can be retried. The constructor accepts an error message and an optional retry delay in milliseconds. This provides a standardized error type for handling HTTP rate-limiting scenarios in edge runtime environments.

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commit: ad56c12