feat(agent-toolkit): add get_asset_upload_url and finalize_asset_upload tools

[Mikolajku]

Summary

Adds two new MCP tools enabling AI agents to upload files to monday.com and attach them to file columns on board items.

Tools added

get_asset_upload_url — Step 1: request a presigned S3 upload URL.

• Inputs: fileName, contentType, fileSize (max 500MB)
• Returns: upload_id, upload_url, url_expires_at

finalize_asset_upload — Step 2: finalize the upload and attach to a column.

• Inputs: uploadId, etag (from PUT response headers), boardId, itemId, columnId
• Returns: asset_id, filename, content_type, file_size, url, filelink

Usage example

1. get_asset_upload_url(fileName="report.pdf", contentType="application/pdf", fileSize=204800)
   → { upload_id: "abc", upload_url: "https://s3.../presigned", url_expires_at: "..." }

2. curl -i -X PUT "<upload_url>" -H "Content-Type: application/pdf" --data-binary @report.pdf
   → capture ETag header: "d41d8cd98f00b204e9800998ecf8427e"

3. finalize_asset_upload(uploadId="abc", etag="d41d8cd...", boardId="123", itemId="456", columnId="file_col")
   → { asset_id: 789, filename: "report.pdf", filelink: "https://..." }

Both tools use versionOverride: 'dev' as create_upload/complete_upload are currently dev-schema-only.

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