implement file splitting functionality and enhance documentation

[Zhangg7723]

Summary

• Added split_file and split_file_upload methods to support file chunking via local paths, URLs, and uploads.
• Updated README.md to include detailed examples for text and file splitting methods.
• Enhanced error handling for unsupported parsers and invalid file inputs.
• Introduced tests for file splitting functionalities to ensure reliability.

Solution Description

[dosubot]

Related Documentation

Checked 7 published document(s) in 1 knowledge base(s). No updates required.

^{How did I do? Any feedback?}