feature: Add autotune for HyperparameterTuner

[maxc01]

Issue #, if available:

Description of changes:

• HyperparameterTuner constructor: add extra fields for autotune functionality, _map_tuning_config and _map_training_config are adapted for autotune
• Session: add autotune field to create_tuning_job

Testing done:

• unit test
• end2end integration test

Merge Checklist

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Tests

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[sagemaker-bot]

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[claytonparnell]

/bot run slow-tests

[codecov-commenter]

Codecov Report

Merging #3892 (7c20173) into master (4903d9b) will decrease coverage by 0.73%.
The diff coverage is 84.12%.

@@            Coverage Diff             @@
##           master    #3892      +/-   ##
==========================================
- Coverage   90.08%   89.36%   -0.73%     
==========================================
  Files        1148      269     -879     
  Lines      106048    26268   -79780     
==========================================
- Hits        95533    23474   -72059     
+ Misses      10515     2794    -7721     

Impacted Files	Coverage Δ
src/sagemaker/session.py	78.29% <33.33%> (ø)
src/sagemaker/tuner.py	91.22% <96.07%> (ø)

... and 1415 files with indirect coverage changes

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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-slow-tests
• Commit ID: 7c20173
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