Move JaCoCo commands to a separate module

There are a few functions and code in this module that handle JaCoCo code coverage format. Suggest moving functions out of this module and making them generic in a separate module, so that this module's tasks can reuse them.

It would simplify this module, but more it would potientally make it easier to get additional help from the code coverage community if the community can collaborate around a module focused on the JaCoCO code coverage format.

Start by locating the module functions and code that handle the JaCoCo coverage format, then review how this module's tasks reuse them. Identify the generic JaCoCo functionality that belongs in a separate module and verify that the existing tasks still work after the extraction.

Written by the indexing model from the issue text.