Allowing to use globally/locally installed node modules instead of installing extensions to ".autorest" folder

[omazany]

Hello we are testing whether we can use autorest in our corporate environment which is very restrictive:

• we can't use default npm repository but we use our own nexus server that scans all the packages for vulnerabilities
• we can't access directly github.com as we are behind corporate proxy and downloading data directly from there is not allowed

Although we can change the default registry with "autorest_registry" environment variable, we can't easily override the default behavior of autorest downloading the extensions from github.com and installing them into "%USERPROFILE%.autorest" folder.

The solution seem to be that autorest would use the globally installed node modules, which can be installed from the corporate Nexus repository.

Would that be possible to implement?