Resiliency features update

[jbieniusiewi]

What does this PR do ?

Changes for the updated version of resiliency features:

• Fault Tolerance
• Straggler Detection

Collection: [Note which collection this PR will affect]

Changelog

• Updated/clarified documentation
• Removed duplicated "straggler detection" section from the documentation
• Updated straggler detection unit test
• Do not pass logger instance to the straggler det. callback
• Exposed safety_factor FT param
• Pass exp_dir to the FT callback

Usage

• You can potentially add a usage example below

# Add a code snippet demonstrating how to use this 

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PR Type:

• New Feature
• Bugfix
• Documentation

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Additional Information

• Related to # (issue)