Fix Windows path handling for cloud storage

[smbrandonjr]

Use posixpath.join instead of os.path.join to ensure consistent forward slashes for cloud storage paths across all platforms. This resolves the FileNotFoundError: b//o on Windows.

Description

This PR fixes an issue with path handling on Windows platforms. The problem occurs because os.path.join() uses backslashes (\) as path separators on Windows, but cloud storage systems like GCS require forward slashes (/).

Changes Made

• Added a helper method _join_cloud_path to handle cloud storage path joining consistently across platforms
• Used posixpath.join() instead of os.path.join() for all cloud storage path operations
• Added debug logging to help diagnose path-related issues

Testing

Tested and confirmed working on Windows 11 Pro.

Issue

Fixes the FileNotFoundError: b//o error when using the library on Windows.