feat: add type definitions for additional OSS object operations (#11)

Add comprehensive type definitions and tests for multiple OSS
operations:
- Batch operations: deleteMulti for deleting multiple objects
- Object tagging: getObjectTagging, putObjectTagging,
deleteObjectTagging
- Multipart upload: initMultipartUpload, completeMultipartUpload,
multipartUpload, multipartUploadCopy, abortMultipartUpload, listUploads,
uploadPartCopy
- Append operations: append for appendable objects

All methods include complete TypeScript type definitions with options
and result interfaces, along with comprehensive type tests.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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## Summary by CodeRabbit

* **New Features**
  * Added append functionality for objects with position support.
  * Added bulk delete operations supporting multiple syntax options.
  * Added object tagging capabilities (get, set, delete).
  * Added multipart upload workflow (init, complete, abort).
  * Added list uploads and upload part copy operations.

* **Chores**
  * Updated development dependencies.
  * Added CommonJS and ESM export entry points.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: Claude <noreply@anthropic.com>

Author: killagu