Fix for "X zip is required for packaging a theme" on Windows

[mgmanzella]

WHY are these changes introduced?

Fixes #2513

WHAT is this pull request doing?

Modifies the package command to use a 7zip to zip files when theme package is run on Windows

How to test your changes?

Machine Setup

The test steps should be run on all platforms.

Mac

• Clone shopify-cli repo
• Add the following to ~/.zshrc and replace with your machine username:

alias shopify-dev="/Users/<USERNAME>/src/github.com/Shopify/shopify-cli/bin/shopify"

Windows

• Clone shopify-cli repo and checkout branch with changes
• Change shopify.bat name in the bin folder of the repo to shopify-dev.bat
• Add the bin folder to the PATH
• Restart machine
• Confirm setup works by running shopify-dev version

Linux

TODO

Test Steps

1. If you don't have a theme available, shopify-dev theme init
2. shopify-dev theme package <path/to/theme>
3. Confirm zip file is generated in theme directory with theme name and version as the name
4. Unzip the zip file and confirm only directories in THEME_DIRECTORIES are present
5. Confirm nested folders were also included
6. cd <theme-name>
7. shopify-dev theme package
8. Repeat steps 3-5

Post-release steps

• Open issue in shopify-dev to update theme package docs to indicate we only support 7zip for theme package on windows

Update checklist

• I've added a CHANGELOG entry for this PR (if the change is public-facing)
• I've considered possible cross-platform impacts (Mac, Linux, Windows).
• I've left the version number as is (we'll handle incrementing this when releasing).
• I've included any post-release steps in the section above (if needed).

[karreiro]

Great stuff, @mgmanzella! 🚀 LGTM and works on Windows as well :)

What do you think about handling 7z as a fallback of the zip command?

Some Linux distributions might not have the zip command, but they may have 7z, so we'd cover this case.

Thank you for this PR!

[mgmanzella]

What do you think about handling 7z as a fallback of the zip command?

great idea!! @karreiro i made changes to do this and left some comments for you to look at 🙏

[karreiro]

Thank you for the updates, @mgmanzella!

I've added a minor comment about the which method :)

[karreiro]

Thanks a lot, @mgmanzella! LGMT and works greatly too!