Feat: useAbsolutePath for lcov reports

[samitha9125]

Istanbul now generates lcov.info reports with relative path rather than absolute as explains in this merge request. Thus, it is required to have a parameter to explicitly tell the plugin to use relative path.

useAbsolutePath: false

by adding above parameter to passing configs, this can be achieved now. If you are generating lcov reports using a latest istanbul reporter such as nyc or c8, this prop should be used.

[darcy-rayner]

Hi @samitha9125 , thanks for the PR.
It's hard to read the diff with all the formatting changes. Would it be possible to apply those changes and the prettierrc in a follow up PR?