Fix: Inability to get file size from HuggingFace downloader

1. What does this PR do?

This PR fixes the file size retrieval logic in HuggingFaceDownloader. The key changes include:

• In the getWhisperKitFileSize method, a fallback mechanism is now triggered when the Content-Length from a HEAD request is invalid (e.g., less than or equal to 0).
• A new private method, getFileSizeWithRangeRequest, has been added. It sends a GET request with a Range: bytes=0-0 header to retrieve the file's Content-Range information, from which the accurate total file size is parsed.

2. Why is this PR needed?

When running the swama pull whisper-tiny command, the program would crash due to a division-by-zero error. The root cause is:

• The HuggingFace server does not return a Content-Length header for HEAD requests on files with content compression enabled (like gzip or br), causing httpResponse.expectedContentLength to return -1.
• This invalid value was treated as 0 and passed as the total parameter to the ProgressBar.
• In the ProgressBar, a division-by-zero error occurred when calculating the download percentage (percent = downloaded / total), leading to a crash.

This PR resolves the issue by implementing a more reliable mechanism for fetching the file size.

3. Related Discussions

• Fixes the runtime crash Fatal error: Double value cannot be converted to Int because it is either infinite or NaN that occurred during swama pull.

4. How was this tested?

• Manual Testing:
  • Set the environment variable: export SWAMA_REGISTRY=HUGGING_FACE.
  • Run the command: swama pull whisper-tiny.
  • Verified that the download process no longer crashes and now displays the correct percentage progress bar.

5. Impact Analysis

• Scope: This change only affects the HuggingFaceDownloader and has no impact on ModelScopeDownloader or other modules.
• Risk: The risk is low. This change adds a more robust fallback for file size retrieval, improving the stability of model downloads from HuggingFace.
• Reviewer Focus:
  • The implementation logic of the getFileSizeWithRangeRequest method.
  • The condition for triggering the fallback mechanism