feature: Decode application/x-npz content type

[bveeramani]

Issue #, if available:

Description of changes: Added _decode_npz_to_matrix to decoders.py.

Testing done: Added tests to test_decoders.py.

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-inference-toolkit-pr
• Commit ID: c8655f10ddfaddb0080819a67a68d429f8c5e910
• Result: FAILED
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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-inference-toolkit-pr
• Commit ID: 49f2c07f136465b4211527701aa719ef90e69558
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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