Added simple coverage report

[AntoniosBarotsis]

Main Changes

Added a simple coverage report that shows you how many times each Expr case class is used in the tests.

The output currently looks ugly, in the future I'll look into the possibility of using CodeCov.

Edit

Turns out adding CodeCov was a lot less complicated than what I was expecting so I did that.

The coverage is no longer printed in the console as shown in the picture earlier (although it is easy to add it back if that is wanted, see here).

The Coverage class now also associates the covered classes with their respective lines in the Definitions.scala file meaning you can now get clean detailed views. Currently, "low" coverages won't fail a pipeline but that along with other stuff like what is considered "low" coverage can be changed from the codecov.yml file.

The coverage report is a bit weird now because the base (source repo) does not have any reports yet but that should fix itself post-merge. Link to the CodeCov report.

Also epic badge [![codecov](https://codecov.io/gh/pijuskri/Po-Sharp/branch/dev/graph/badge.svg)](https://codecov.io/gh/pijuskri/Po-Sharp/).

Other

As noted in the documentation, any Expr case class can be omitted from the coverage results if it is considered unimportant.

The pull request also includes:

• some refactorings
• small improvements in error messages
• a bug fix that would cause some tests to randomly fail.

[AntoniosBarotsis]

Pipeline consistently fails with Compilation failed with scala.Parser$ParseException: parsing fail which I cannot seem to replicate locally, will have to look into that.

[AntoniosBarotsis]

The issue was that my branch had an outdated Exception definition. That was fine locally but the pipeline used the remote definition since that would be the end result of the merge and thus kept failing.

Moral of the story; always merge the remote branch to your branch before making a pull request.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (dev@fd215bb). Click here to learn what that means.
The diff coverage is n/a.

@@          Coverage Diff           @@
##             dev       #9   +/-   ##
======================================
  Coverage       ?   66.66%           
======================================
  Files          ?        1           
  Lines          ?       45           
  Branches       ?        0           
======================================
  Hits           ?       30           
  Misses         ?       15           
  Partials       ?        0           

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[pijuskri]

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