feat: sagemaker client updates for batched image

[zanussbaum]

:rocket:	This description was created by Ellipsis for commit c14465ee987b8240c082892c4a6ea9aca1c28f0a

Summary:

Updated SageMaker client to handle batched image requests using multipart/form-data and modified instance type in batch transform.

Key points:

• Updated nomic/aws/sagemaker.py to handle batched image requests using multipart/form-data.
• Added nomic/aws/sagemaker.py::prepare_multipart_request to prepare multipart body for image requests.
• Modified nomic/aws/sagemaker.py::preprocess_image to return multipart body and boundary.
• Updated nomic/aws/sagemaker.py::sagemaker_image_request to use multipart/form-data content type.
• Changed nomic/aws/sagemaker.py::embed_image to process images in batches.
• Updated instance type in nomic/aws/sagemaker.py::batch_transform_image to ml.g4dn.xlarge.
• Bumped version in setup.py from 3.0.41 to 3.0.42.

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