fix: org name validation

[Kirpal]

Description

When trying to use the new --org-name support I found that underscores were not being supported. After looking a little closer, the regex for the org name was incorrect by not enforcing that segments must start with a letter and by enforcing a min/max of three segments.

I updated the org name regex, invalid org error message, and added more tests for edge cases.

Sources:

• Android rules
• iOS rules
• Flutter android validation

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore

[felangel]

Before this can be merged we will need to update the template to support dynamic length for org name parts.