createStoreMap
Create a store map and evaluate this state callback. The map is returned.
If this is null, an empty map is returned.
Note: May throw any exception since StateCallback.reduceState can itself throw any exception. Consider wrapping use of createStoreMap with runCatching, e.g. use withStoreMap instead.
See also
Wraps createStoreMap with error-handling for producing ExpectationResults