feat: add upload and download support for work item attachments

[akhil-vamshi-konam]

Description

Adds helper methods for handling work item attachments end-to-end:

• upload_from_bytes() to upload attachment content directly from memory.
• get_download_url() to retrieve a presigned download URL for an attachment.
• Handles the complete attachment upload flow:
  1. Create attachment record
  2. Upload file to S3 using the presigned URL
  3. Mark attachment as uploaded

Also bumps SDK version from 0.2.15 to 0.2.16.

Type of Change

• Feature (non-breaking change which adds functionality)

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5b4c4e83-5085-457f-a59a-10187b5e858d

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat-attachments

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}