Adds an experimental option (experimental: "automatic-module-directories") to automatically detect the modules inside mono-repos.

The launches of the run are not in parallel because this would create a real mess in the logs.
The GitHub Action jobs are not made to run in parallel outside the matrix system.

This is an experimental feature because I don't know the performance of NodeJS to walk the directory tree to detectgo.mod files.

If the performances are not good enough, another possibility is to create an option (module-directories) to define the directories.
But actions don't support arrays as inputs, so it will be a comma-separated string.
In this case, because it will be challenging to have something portable on all operating systems,
the users will have to manually define the module directories or use something external (ex,find . -name go.mod -exec readlink -f {} \; | xargs -I{} dirname {} | paste -sd,)

Related to#1226
Related to#74