feature: support for Sample Weights for SageMaker Autopilot (Flintstone)

[cbechir]

Issue #, if available:
N.A

Description of changes:
This change allows Autopilot customers to now provide a sample weight column when creating an Autopilot job with ENSEMBLING mode only. If specified, this column name indicates which column of the dataset should be treated as sample weights for use by the objective metric during the training, evaluation, and the selection of the best model.

Testing done:

• Ran all unit tests and ensured they pass.
• Modified unit tests to account for the new optional field
• Conducted a manual test by creating, via the locally updated Python SDK, an autopilot job with sample weight and verified in the Autopilot backend that the job was successfully created and that the sample weights were used.

Merge Checklist

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General

• I have read the CONTRIBUTING doc
• I certify that the changes I am introducing will be backward compatible, and I have discussed concerns about this, if any, with the Python SDK team
• I used the commit message format described in CONTRIBUTING
• [n/a] I have passed the region in to all S3 and STS clients that I've initialized as part of this change.
• I have updated any necessary documentation, including READMEs and API docs (if appropriate)

Tests

• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have added unit and/or integration tests as appropriate to ensure backward compatibility of the changes
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• I have used unique_name_from_base to create resource names in integ tests (if appropriate)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[codecov-commenter]

Codecov Report

Merging #3833 (c19c209) into master (4ca7d41) will decrease coverage by 0.75%.
The diff coverage is 72.72%.

@@            Coverage Diff             @@
##           master    #3833      +/-   ##
==========================================
- Coverage   89.89%   89.14%   -0.75%     
==========================================
  Files        1060      247     -813     
  Lines      101188    25050   -76138     
==========================================
- Hits        90961    22331   -68630     
+ Misses      10227     2719    -7508     

Impacted Files	Coverage Δ
src/sagemaker/session.py	78.22% <ø> (ø)
src/sagemaker/automl/automl.py	89.96% <62.50%> (ø)
src/sagemaker/remote_function/client.py	96.86% <100.00%> (ø)

... and 1304 files with indirect coverage changes

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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-slow-tests
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[mufaddal-rohawala]

Generally its not recommended to have a new argument added in the middle for backwards compatibility reasons as it can break the existing code of our customers using this functionality without keyword arguments, can we move this argument to the end?

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• CodeBuild project: sagemaker-python-sdk-notebook-tests
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• CodeBuild project: sagemaker-python-sdk-slow-tests
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[mufaddal-rohawala]

closing as this was merged as part of - #3835