* Added Step Function Activity & Step Function State Machine
* Added SFN State Machine documentation
* Added aws_sfn_activity & documentation
* Allowed import of sfn resources
* Added more checks on tests, fixed documentation
* Handled the update case of a SFN function (might be already deleting)
* Removed the State Machine import test file
* Fixed the eventual consistency of the read after delete for SFN functions
Gauthier Wallet