Limit payload for request queue batch add

[drobnikj]

The maximum payload which Apify API handles is 9MB.
In some cases, the batch add requests payload overflow, and operation ends up with errors like:

2023-11-03T04:41:10.297Z ERROR Request batch insert failed
2023-11-03T04:41:10.299Z   ApifyApiError: The POST payload is too large (limit: 9437184 bytes, actual length: 9453568 bytes).(details: type=request-too-large)
2023-11-03T04:41:10.301Z     clientMethod: RequestQueueClient.batchAddRequests
2023-11-03T04:41:10.303Z     statusCode: 413
2023-11-03T04:41:10.305Z     type: request-too-large
2023-11-03T04:41:10.307Z     attempt: 1
2023-11-03T04:41:10.309Z     httpMethod: post
2023-11-03T04:41:10.311Z     path: /v2/request-queues/xxxxx/requests/batch
2023-11-03T04:41:10.313Z     stack:
2023-11-03T04:41:10.314Z       at makeRequest (/usr/src/app/node_modules/apify-client/dist/http_client.js:184:30)
2023-11-03T04:41:10.316Z       at runMicrotasks (<anonymous>)
2023-11-03T04:41:10.318Z       at processTicksAndRejections (node:internal/process/task_queues:96:5)
2023-11-03T04:41:10.320Z       at async RequestQueueClient._batchAddRequests (/usr/src/app/node_modules/apify-client/dist/resource_clients/request_queue.js:130:26)
2023-11-03T04:41:10.322Z       at async RequestQueueClient._batchAddRequestsWithRetries (/usr/src/app/node_modules/apify-client/dist/resource_clients/request_queue.js:153:34)

Let's chunk the payload into smaller batches to avoid these errors.