Add action and condition for counting list items
Problem/Motivation
We need to determine the number of items in a list.
Steps to reproduce
Proposed resolution
For counting, we could implement an action that counts items on a specified Token and sets the count result into another token. For convenience, we could additionally implement a condition "number of items" extending from StringComparisonBase. That count action would only address "real" lists as we already have "Compare two scalar values" that may directly count a string length.
Remaining tasks
User interface changes
API changes
Data model changes
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