Constraint support for warning case

[FikriMilano]

Is your feature request related to a problem? Please describe.
Currently, constraint-extension support can only display errors. While FHIR mentions it can support errors and warnings.

Describe the solution you'd like
It should also be able to display warnings.

Describe alternatives you've considered
N/A

Additional context

• Need @shelaghm help on the UI design for warnings.
  FYI, we display errors below the field, we might want to do the same for warnings but with yellow color(?)
• Documentation of constraint Severity Types https://hl7.org/fhir/codesystem-constraint-severity.html
• Ticket for error case Support questionnaire-constraint Extension #1849
• PR for error case Constraint support (local and error case only) #2199

Would you like to work on the issue?
Yes