feat: add support for string comment attachments

[Copilot]

Extends the StringComments module to support the new attachment capabilities added to the Crowdin API — attaching files when creating a comment, receiving attachment data in responses, and deleting attachments from existing comments.

Changes

• New Attachment interface — response model for attachment objects (id, name, mime, size, category, thumbnailUrl, url, downloadUrl)
• New AttachmentRequest interface — request model for referencing a storage item by id
• StringComment — added optional attachments?: Attachment[] field
• AddStringCommentRequest — added optional attachments?: AttachmentRequest[] field
• deleteStringCommentAttachment(projectId, stringCommentId, attachmentId) — new method for DELETE /projects/{projectId}/comments/{commentId}/attachments/{attachmentId}, returns updated StringComment

Usage

// Create a comment with attachments (storage IDs from Upload Storage API)
const comment = await crowdin.stringComments.addStringComment(projectId, {
    stringId: 42,
    text: 'See attached screenshot',
    type: 'comment',
    targetLanguageId: 'uk',
    attachments: [{ id: 123 }],
});

// comment.data.attachments contains full Attachment objects

// Remove a specific attachment
await crowdin.stringComments.deleteStringCommentAttachment(projectId, commentId, attachmentId);

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add support for String Comment Attachments</issue_title>
<issue_description>The Crowdin API has been extended with support for attachments in string comments. This enhancement allows you to attach files to string comments and manage these attachments.

The Crowdin API client libraries need to be updated to include the new endpoint and reflect the changes to existing endpoints.

Changes:

• Add Comment - Now supports attachments request parameter to attach files when creating a comment
• Get Comment - Response now includes attachments field with attached files

New Endpoint:

• Delete Comment Attachment - Remove an attachment from a string comment</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add support for String Comment Attachments #595

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.18%. Comparing base (1dd461e) to head (ddf86d7).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #633      +/-   ##
==========================================
+ Coverage   90.16%   90.18%   +0.02%     
==========================================
  Files          40       40              
  Lines        2083     2086       +3     
  Branches      243      243              
==========================================
+ Hits         1878     1881       +3     
  Misses         82       82              
  Partials      123      123              

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