Add a -CoverageFile for Convert-CodeCoverage

[Jaykul]

As a module author
In order to understand my code coverage
I need to use CodeCov.io and other such tools

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Basically I just want to overwrite Pester's coverage file with one based on the modified output of Convert-CodeCoverage. If that's already possible by piping this to some Pester functions, can you put an example of how to do it in the help for Convert-CodeCoverage so others can figure out how -- or better yet, just add a parameter and do it yourself...

[johlju]

There is code here that might help with this issue. Happy to see this functionality be implemented in ModuleBuilder instead so that we can just call a command from the task. Anyway, hope anything can be reused or used as an inspiration.

https://github.com/gaelcolas/Sampler/blob/bc25ba558383d3ddba7ded9a2e51233f2bc9d4e7/.build/tasks/JaCoCo.coverage.build.ps1#L328-L457

The main activities the task does:

• Coverts hits and misses using this modules' ConvertTo-SourceLineNumber (but uses the alias Convert-LineNumber)
• Create a new JaCoCo file from the converted coverage.
• Updated the JaCoCo statistics in the new JaCoCo file.