emit lifecycle event progress to webhooks for extracting captions

[bghira]

This pull request adds progress tracking and webhook notification support to the caption extraction process in the get_all_captions function. When using the "huggingface" caption strategy, the system now sends real-time updates about the extraction stage, including progress and completion/failure statuses, which can be consumed by external systems or UIs.

Enhancements to caption extraction progress reporting:

• Added logic to initialize and send progress updates via a webhook handler when the "huggingface" caption strategy is used. This includes sending lifecycle stage notifications at the start, during progress, on completion, and on failure. [1] [2]
• Progress is tracked based on the number of processed images, with updates sent every 1% or at least every 100 images, and detailed status is included in each notification.

Error handling and robustness:

• Implemented try/except/finally blocks to ensure that failure or completion notifications are always sent, even if an exception occurs during caption extraction.