docs: add batch parse directory example notebook

[rbisecke]

Summary

Adds a comprehensive Jupyter notebook demonstrating the LlamaCloud batch processing API workflow for parsing multiple files in a directory.

The notebook walks through:

• Creating a directory via the batch processing API
• Uploading multiple PDF files to the directory
• Submitting a batch parse job with configuration
• Monitoring job progress with status polling
• Viewing job items and processing results

The example uses direct HTTP calls with the requests library and includes sample PDF downloads (Attention is All You Need and BERT papers) for demonstration purposes.

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Latest commit: c676a11

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