Add code coverage

[mrp089]

Problem

We have integration tests (2067324) and unit tests (4aac52c) in this repository, but no information on code coverage.

Solution

Add coverage like we did in SimVascular/svMultiPhysics@9c45987 and SimVascular/svZeroDSolver@06d92ed

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct and Contributing Guidelines