Add Hono adapter for edge runtimes

[Prateek32177]

Motivation

• Provide first-class Hono integration so the SDK works natively on Hono-powered edge runtimes while matching existing adapter behavior and surface.
• Ensure the adapter reads raw request bytes via Hono's c.req.raw, uses Hono Request/Response primitives only, and supports queueing and alerting like other adapters.

Description

• Add a typed Hono adapter implementing createWebhookHandler at src/adapters/hono.ts that calls WebhookVerificationService.verifyWithPlatformConfig, supports queue, alerts, normalize, toleranceInSeconds, and returns a Hono-compatible handler that receives c and uses c.req.raw.
• Add an adapter entrypoint src/hono.ts and re-export the Hono API from the adapters barrel in src/adapters/index.ts, and include HonoContextLike/HonoWebhookHandlerOptions types.
• Update package.json exports and typesVersions to expose ./hono, add discoverability keywords, and update documentation in README.md and USAGE.md with Hono usage examples.
• Add tests exercising Hono flows in src/test.ts (valid verification path and invalid-signature path) to match the existing adapter test pattern.

Testing

• Built the project with npm run build and the TypeScript compilation completed successfully.
• Ran the test suite with npm test and all tests passed, including the new Hono adapter tests.
• No new dependencies were added.

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Codex Task