Allow for multiple "package instances"

### What You Are Seeing?

I can only install one "copy" of a package at a time, even if it is a zip package that would support modifying the configuration and installing multiple copies.

### What is Expected?

I would like to have Chocolatey allow me to install the package with various different arguments (config settings) and have some way of displaying the different "configs" I have installed, even if this requires a new flag like -mpi or something.

### Discussion


UPDATE: As Chocolatey Gitter chat is now unavailable, I've added a screenshot of the Gitter chat.

### Feature Request

Add the ability to provide multiple package instances, with a "required" flag/parameter that specifies the string that will be used to identify the different versions after they are installed.

For example:
choco list -l
MyPackage

After allowing multiple instances:
MyPackage
MyPackage CustomInstall
MyPackage NotVanilla

The additional ones would be installed via `choco install --multipackageinstances -params '"ConfigName=CustomInstall OtherArgs=etc"'.

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