Files
Rohan Verma ba9ef916bc feat: add multipart upload support
"Verify the multipart upload implementation works correctly by running integration tests against MinIO and validating file integrity, parallel uploads, and error handling."

Core APIs:
- Add InitiateMultipartUpload for starting multipart uploads
- Add UploadPart for uploading individual parts (5MB-5GB)
- Add CompleteMultipartUpload to finalize uploads
- Add AbortMultipartUpload to cancel and cleanup uploads
- Add ListParts to query uploaded parts

High-Level Features:
- Add FileUploadMultipart API with automatic chunking
- Add uploadPartWithRetry with exponential backoff (3 retries default)
- Add parallel upload worker pool with configurable concurrency
- Add progress callbacks for real-time upload tracking
- Add GeneratePresignedUploadPartURL for browser-based uploads

Advanced Features:
- Automatic file chunking with configurable part sizes (5MB-5GB)
- Parallel upload worker pool with configurable concurrency
- Retry logic with exponential backoff (configurable retries)
- Real-time progress tracking with upload speed calculation
- Automatic cleanup on errors via AbortMultipartUpload
- Support for resumable uploads via ListParts
- Comprehensive input validation for all parameters
- File integrity verification across all upload modes

Testing:
- Add comprehensive integration tests (500+ lines)
- Test sequential uploads (15MB, 3 parts, ~45 MB/s)
- Test parallel uploads (20MB, 4 parts, concurrency=3)
- Test small files (3MB, single part)
- Validate abort and ListParts functionality
- Test input validation and error cases
- Verify file integrity with hash comparison
- All tests passing against MinIO

Documentation:
- Update README with multipart upload examples
- Add high-level and low-level API usage
- Document browser-based multipart uploads
- Mark multipart upload implementation as complete in ROADMAP
- Update gitignore to exclude *.bin and test-output.log

Verified against MinIO with complete test coverage.
2025-11-27 02:16:16 +05:30

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### Go ###
# Binaries for programs and plugins
*.exe
*.exe~
*.dll
*.so
*.dylib
*.bin
# Test binary, build with `go test -c`
*.test
# Output of the go coverage tool, specifically when used with LiteIDE
*.out
# Test output logs
test-output.log
### Go Patch ###
/vendor/
/Godeps/
### Code ###
# Visual Studio Code - https://code.visualstudio.com/
.settings/
.vscode/
tsconfig.json
jsconfig.json
.env
# direnv
.direnv