feat: Add async iterable methods for paged API responses

[Copilot]

Overview

This PR adds async generator methods to the OnspringClient class, enabling developers to easily iterate over paged API responses using modern JavaScript for await...of syntax. This addresses issue #[issue_number] by providing a more ergonomic way to work with large datasets without manual pagination management.

What's Changed

Added five new async iterable methods that automatically handle pagination:

• getAppsIterable(pageSize = 50) - Iterate over all apps/surveys
• getFieldsByAppIdIterable(appId, pageSize = 50) - Iterate over fields in an app
• getRecordsByAppIdIterable(appId, fieldIds = [], dataFormat = DataFormat.Raw, pageSize = 50) - Iterate over records in an app
• queryRecordsIterable(appId, filter, fieldIds = [], dataFormat = DataFormat.Raw, pageSize = 50) - Iterate over query results
• getReportsByAppIdIterable(appId, pageSize = 50) - Iterate over reports in an app

Usage Example

Before (manual pagination):

let pageNumber = 1;
let hasMorePages = true;

while (hasMorePages) {
  const response = await client.getRecordsByAppId(
    new GetRecordsByAppIdRequest(appId, [], DataFormat.Raw, new PagingRequest(pageNumber, 50))
  );
  
  if (!response.isSuccessful) break;
  
  for (const record of response.data.items) {
    console.log(record);
  }
  
  hasMorePages = pageNumber < response.data.totalPages;
  pageNumber++;
}

After (async iteration):

for await (const record of client.getRecordsByAppIdIterable(appId)) {
  console.log(record);
}

Implementation Details

• Each method is an async generator function that yields individual items from paginated responses
• Pagination is handled automatically - methods continue fetching pages until all data is retrieved
• Iteration stops gracefully on API errors or when all pages are exhausted
• All methods support optional pageSize parameter (default: 50) for controlling request sizes
• Methods maintain consistency with existing SDK patterns and parameter defaults

Testing

• Added 25 comprehensive test cases covering:
  • Multi-page iteration scenarios
  • Error handling and early termination
  • Default parameter usage
  • Edge cases
• Achieved 100% test coverage across all metrics (statements, branches, functions, lines)
• All 858 tests passing (833 existing + 25 new)

Documentation

• Added JSDoc comments with parameter descriptions and return types
• Included usage examples in method documentation
• Methods follow TypeScript async iterable conventions for IDE autocomplete support

Breaking Changes

None. This is a purely additive change that introduces new methods without modifying any existing functionality.

Warning

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• api.onspring.dev
  • Triggering command: node /home/REDACTED/work/onspring-api-sdk-javascript/onspring-api-sdk-javascript/node_modules/.bin/mocha -R progress -r ts-node/register ./tests/**/*.spec.ts (dns block)

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>[FEAT]: Add client methods to support async iterables</issue_title>
<issue_description>The OnspringClient should expose methods that allow the user to asynchronously iterate over all the pages of items that support paged responses.

So should be able to do something like this:

for await (const record of client.getRecords()) {
}
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

Fixes #17

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