feat!: improve channel protocol structure

[jonaslagoni]

Note

Refactors the TypeScript channels generator to emit one file per protocol with namespace re-exports, updates templates/clients accordingly, and documents the breaking change.

• Channels Generator (TypeScript):
  • Output changed from single Protocols object to multi-file: one file per protocol (nats.ts, kafka.ts, mqtt.ts, amqp.ts, event_source.ts, http_client.ts, websocket.ts) plus index.ts re-exporting protocol namespaces.
  • Functions now emitted as standalone function exports (no object property syntax); per-protocol dependency imports collected via collectProtocolDependencies.
  • Finalization writes individual protocol files and an index; updated NATS client to import from ./nats.
  • Protocol templates (NATS/Kafka/MQTT/AMQP/EventSource/HTTP/WebSocket) updated to match new function export style and include headers/parameters handling.
• Docs:
  • Update docs/generators/channels.md to show new import patterns and file structure.
  • Add migration note docs/migrations/v0.md for breaking change 0.61.0.
• Tests:
  • Replace snapshots; add protocol-specific snapshots and fixtures (asyncapi-channels.yaml); adjust channel tests.
• Tooling:
  • Scripts: add runtime:typescript:clean; prepare:pr now runs runtime TS generate; use cross-env in runtime tests.
• Misc:
  • Minor runtime/types changes (e.g., TopicsMap), .gitignore tweaks.

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[jonaslagoni]

🎉 This PR is included in version 1.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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