feat(Bedrock): add image support to Bedrock

[geekbass]

Important

Adds image support to Bedrock by converting OpenAI-style image parts to Bedrock format and updates related utilities and tests.

• Behavior:
  • Adds _normalize_bedrock_image_format() to map image types to Bedrock's format in utils.py.
  • Adds _openai_image_part_to_bedrock() to convert OpenAI-style image parts to Bedrock format in utils.py.
  • Updates _prepare_bedrock_converse_kwargs_internal() to handle image content conversion in utils.py.
• Tests:
  • Adds test_bedrock_native_passthrough.py to test Bedrock-native text and image passthrough.
  • Adds test_normalize.py to test image format normalization.
  • Adds test_openai_image_conversion.py to test OpenAI image part conversion.
  • Adds test_prepare_kwargs.py to test preparation of Bedrock API call arguments with images.
  • Adds fixtures in conftest.py for image data used in tests.

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[ellipsis-dev]

Important

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1. instructor/providers/bedrock/utils.py:135

• Draft comment:
  Defaulting to 'jpeg' for unsupported mime types is intentional; consider logging a warning for unexpected mime types for easier debugging in the future.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 85% None

2. instructor/providers/bedrock/utils.py:170

• Draft comment:
  Error handling for data URLs is clear; optionally, include the invalid input value in the error message for enhanced troubleshooting.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 85% None

3. instructor/providers/bedrock/utils.py:181

• Draft comment:
  Good use of specific exception handling for HTTP requests; consider implementing a retry mechanism or centralizing HTTP calls if image fetching failures become common in production.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 85% None

4. tests/llm/test_bedrock/test_openai_image_conversion.py:20

• Draft comment:
  This test depends on an external URL, which may lead to flaky tests. Consider mocking the HTTP request to simulate image fetching reliably.
• Reason this comment was not posted:
  Confidence changes required: 66% <= threshold 85% None

5. tests/llm/test_bedrock/test_openai_image_conversion.py:30

• Draft comment:
  Consider adding tests for unsupported content types in _to_bedrock_content_items to further validate error handling robustness.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 85% None

Workflow ID: wflow_D1FCx1OBWCObmP6U

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[geekbass]

Sorry I'm making this a mess but I'm not getting the PR template.