feat(media): allow disabling media handling via envvar

[hassiebp]

Important

Add LANGFUSE_MEDIA_UPLOAD_ENABLED to control media handling in Langfuse SDK, affecting initialization and processing in resource_manager.py and media_manager.py.

• Environment Variables:
  • Add LANGFUSE_MEDIA_UPLOAD_ENABLED to environment_variables.py to control media detection and upload.
• Resource Management:
  • In resource_manager.py, initialize _media_upload_enabled based on LANGFUSE_MEDIA_UPLOAD_ENABLED.
  • Conditionally start media upload consumers in _initialize_instance() based on _media_upload_enabled.
• Media Handling:
  • In media_manager.py, check _enabled before processing media in _find_and_process_media().
  • Initialize _enabled in MediaManager based on LANGFUSE_MEDIA_UPLOAD_ENABLED.

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Greptile Summary

Disclaimer: Experimental PR review

Added new environment variable LANGFUSE_MEDIA_UPLOAD_ENABLED to control media handling functionality in the Python SDK, with a default value of 'True'.

• Added LANGFUSE_MEDIA_UPLOAD_ENABLED environment variable definition in /langfuse/_client/environment_variables.py
• Implemented media handling toggle in /langfuse/_task_manager/media_manager.py to skip processing when disabled
• Modified /langfuse/_client/resource_manager.py to conditionally start media upload consumer threads based on the setting

[greptile-apps]

LGTM

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