WIP: fix(ls): fix missing ls command

[turboBasic]

Description

Related Issue(s)

This PR is fixes #670

Motivation and Context

Fix missing zinit ls command

Usage examples

zunit tests/ls.zunit

How Has This Been Tested?

Types of changes

• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] Documentation change
• [ ] New feature (non-breaking change which adds functionality)

Checklist:

• [ ] All new and existing tests passed. ⚠️ No, test for zinit ls currently fails
• [x] I have added tests to cover my changes.
• [ ] I have updated the documentation accordingly.

[turboBasic]

I see that the new tests added to tests/ dir are not automatically executed by test runner.

I have moved contents of ls.zunit inside tests/commands.zunit so that failing test is visible in GitHub Actions