feat(map): Support Map Key Type Imports

[jonathan-casey]

Description

Adds logic to support declaration of Map Key Type as an Imported Type. Additional test cases also added.

Author Checklist

• Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• Vital features and changes captured in unit and/or integration tests
• Commits messages follow AP format
• Extend the documentation, if necessary
• Merging to main from fork:branchname

[dselman]

Typo in the jsdoc - this is not map specific.

Not sure we need this function. ModelFile.getType takes a short type name and returns the FQN, taking care of primitive, imported types and reports errors.

The docs for this function are not clear in whether type is a short name or FQN and what happens with primitives, and what happens if the type does not exist (null/undefined return or throws an exception).

In general in Concerto we use "from biggest to smallest" when we order function args, so this would be (model, type).

If you decide we need this function, then the implementation could be:

// decl will be null for primitive types ... or throw exception?

const decl = !ModelUtil.isPrimitiveType((shortName) ? modelFile.getModelManager().getType(modelFile.getType(shortName)) : null;