Usage of fhirPathEngine in Utils should be centralized and made consistent

[maimoonak]

Describe the bug
As per discussion here #1957 (comment) the fhirPathEngine usage should be centralized and made consistent throughout app. There are usages in ExpressionEvaluator, QuestionnaireViewModel and ResourceMapper which should be modified so that all expressions evaluated are passed with corresponding context data consistently.

Component
SDC library

[santosh-pingle]

@maimoonak
Is it okay to add code health label?

[omarismail94]

I think this is resolved now. We only have one fhirPathEngine in FhirPathUtil that gets passed around in the different classes in datacapture. If this is not true, feel free to re-open the issue