Add "Collection" option to group certain packages

[vasilvestre]

Description of the new feature/enhancement

I was navigating on "https://winstall.app/" and they have a great multi-choice UI to easily generate a script that installs all you want in "somewhat" once.
I think that Collections should be an existing thing because it's sometimes needed and should be too much. Even public and private list could exist. Eg : "php-dev-packages" contain php-latest php-opcache php-mbstring etc"

Proposed technical implementation details (optional)

Manifest could now contain of optionable field to create packages. Or maybe another winget-collection that directly use packages from here by default but also using another package via sources

`winget source list
Name Arg

winget https://winget.azureedge.net/cache`

[JoBrad]

Imagine a world where you can winget install python-dev and you no longer have to install the c++ library separately.

[denelon]

We will be implementing #220 Export/Import apps list. The file will be JSON formatted, and the winget client will be able to install all of the packages. We will also be implementing #163 support package dependencies.

[denelon]

Duplicate of #220

[ghost]

Hi! We've identified this issue as a duplicate of another one that already exists on this Issue Tracker. This specific instance is being closed in favor of tracking the concern over on the referenced thread. Thanks for your report!