Step Functions: String startsWith and contains

[thantos]

use condition StringMatch to preform startsWith and contains on a String.

StringMatch only supports static values.

May also be able to StringSplit($.value, $.searchTerm) to accomplish these.

• ArrayLength(StringSplit(..)) > 2 => contains == true.
• ArrayLength(StringSplit(..)) > 2 && arr[0] === "" starts with == true