Reuse imports from same repository

[ArthurSens]

We're seeing that users using the Importer interface often import multiple paths from the same repository. The way the installer is built today, it will clone the repository for every single import.

We can optimize speed here if we allow setting multiple paths for the same import, that way we can clone a repository only once.

The task here is to change this field type to string[] instead of string, then update those 2 functions accordingly[1][2]