Leverage warm pools for AWS Sagemaker

[avishniakov]

Describe changes

I implemented support for Sagemaker Warm Pools to improve the runtime of the Sagemaker orchestrator.
Observed speed-up can be estimated as up to 45% for the step to be provisioned and started. The exact start-up time heavily depends on the base Docker image being used, instance types, and the composition of the steps.

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
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