feat: add UploadFile class for multipart file upload handling

[sansyrox]

Summary

• Adds a new UploadFile class in robyn/upload.py that wraps raw uploaded bytes with file metadata (filename, content_type, size) and provides a file-like interface (read/seek/tell/close) plus context manager support.
• Content type is auto-detected from the filename extension via mimetypes.guess_type, falling back to application/octet-stream.
• Exports UploadFile from the top-level robyn package via __init__.py and __all__.
• Adds unit tests covering construction, seek/tell, content type guessing, explicit content type override, context manager usage, and repr.

Closes #1142

Test plan

• Unit tests pass for all UploadFile functionality
• CI passes on all platforms

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Project	Deployment	Actions	Updated (UTC)
robyn	Ready	Preview, Comment	Apr 11, 2026 11:44pm

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 943a052e-0922-43d0-b4b7-4d2896dc9785

📥 Commits

Reviewing files that changed from the base of the PR and between 3e04c65 and e382a01.

📒 Files selected for processing (3)

• robyn/__init__.py
• robyn/upload.py
• unit_tests/test_upload_file.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/upload-file

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[codspeed-hq]

Merging this PR will not alter performance

✅ 189 untouched benchmarks

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_{Comparing feat/upload-file (e382a01) with main (3e04c65)}