Download the project instead of cloning with git

[sacha-c]

Is your feature request related to a problem? Please describe.
Clone repositories with other methods than regular git cloning.

Reason is that cloning with git (even with --depth=1 downloads git files which can be very sizeable.
The only thing sheriff really needs though are package files & lockfiles, so I think we can make this more efficient.

Describe the solution you'd like
Some options:

• use some git clone magic to filter only the files we want: something along the lines of git clone --filter=package.json|yarn.lock|package-lock.json|poetry.loc ?
• download the repository as an archive, and then unzip it. In this way the .git folder is never downloaded
  • https://docs.gitlab.com/ee/api/repositories.html#get-file-archive

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.