feat: extend connectorTrigger with polling and batching options

[Swapnil Nagar (swapnil-nagar)]

Summary

Extend the Node.js connectorTrigger contract with typed polling and batching options, aligning with Azure/azure-functions-python-library#370.

Changes

• Add documented connector trigger options:
  • deliveryMode: 'Poll' | 'Webhook'
  • connection
  • triggerConfigName
  • cardinality: 'one' | 'many'
  • maxBatchSize
  • maxConcurrentCalls
  • targetPendingEventThreshold
• Require connection and triggerConfigName when deliveryMode is 'Poll', with an error listing missing settings.
• Preserve existing default/webhook usage and custom binding properties.
• Leave optional settings omitted so the extension supplies host-owned defaults.
• Retain existing Node.js batch payload conversion behavior.
• Bump the package version and runtime version constant from 4.16.5 to 4.16.6.

Test Coverage

• Polling configuration and required-field validation.
• Default/webhook compatibility and custom properties.
• Binding metadata for single-event and batch cardinalities.
• Independent batch/concurrency overrides and zero-value preservation.
• String, byte, and empty batch payload conversion.
• Public TypeScript contracts, typed batch handlers, and invalid option types.

Validation

• Full test suite: 481 passing.
• Focused connector and payload-conversion tests: 48 passing.
• Targeted ESLint checks: passed.
• TypeScript compilation (--noEmit): passed.
• Webpack development build: passed.
• Package/runtime version consistency: passed.
• CRLF-aware Git whitespace check: passed.

Notes

• Delivery mode uses canonical TypeScript string literals rather than Python's case-insensitive enum parsing.
• Live Azure Functions connector-extension integration was not exercised.