[TASK] Code Coverage Tracking

Issue Description

Is your feature request related to a problem? Please describe. No. Code coverage tracking merely provides a quantitative approximation of the comprehension of the overall test suite and eases the process of identifying specific areas where additional testing is most valuable.

Describe the solution you'd like A script should be added that allows the user to check the coverage of HERON. It should return detailed information including not only the total coverage percentage, but also the specific percentages for individual files and functions. This script should not mask the results of the tests run.

Describe alternatives you've considered Manually approximating which files, functions, etc. need additional testing is far less precise than checking coverage, and is thus not a good solution.

For Change Control Board: Issue Review

This review should occur before any development is performed as a response to this issue.

[x] 1. Is it tagged with a type: defect or task?
[x] 2. Is it tagged with a priority: critical, normal or minor?
[x] 3. If it will impact requirements or requirements tests, is it tagged with requirements?
[x] 4. If it is a defect, can it cause wrong results for users? If so an email needs to be sent to the users.
[x] 5. Is a rationale provided? (Such as explaining why the improvement is needed or why current code is wrong.)

For Change Control Board: Issue Closure

This review should occur when the issue is imminently going to be closed.

[x] 1. If the issue is a defect, is the defect fixed?
[x] 2. If the issue is a defect, is the defect tested for in the regression test system? (If not explain why not.)
[x] 3. If the issue can impact users, has an email to the users group been written (the email should specify if the defect impacts stable or master)?
[x] 4. If the issue is a defect, does it impact the latest release branch? If yes, is there any issue tagged with release (create if needed)?
[x] 5. If the issue is being closed without a pull request, has an explanation of why it is being closed been provided?

idaholab / HERON