Support Map

[kbrock]

Add support for Map.
This and Parallel are the last remaining States to be implemented

ASL Spec: https://states-language.net/#map-state

Map:

• Implement Map state #184
• Run Map iterations in parallel up to MaxConcurrency #283
• Handle either tolerated_failure_count or tolerated_failure_percentage #284
• Return ExceedToleratedFailureThreshold if ToleratedFailureCount/Percentage is present #285
• [WIP] Implement Map ItemReader #293
• Add Map ItemBatcher/ItemSelector #294
• TODO implement ResultWriter

[miq-bot]

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