[Feature] Installing PowerShell modules globally

[gerardog]

Feature Request

Is your feature request related to a problem? Please describe.

Scoop currently does not support installing PowerShell modules globally.

It throws the following error: Installing PowerShell modules globally is not implemented!

Fixes: ScoopInstaller/Main#4989 & #5597

Describe the solution you'd like

However, doing so may not be so hard:

• Installing a PS Module for the current user is done by creating a directory junction from $scoopdir\modules\$module_name to the module location (in my case ~\scoop\apps\{app}\current)
• Installing it globally can be done by linking $env:ProgramFiles\WindowsPowerShell\Modules\$module_name to the module location.

[gerardog]

Implemented by #5611